Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 07-07-2014, 12:28 AM   #1
34cab
Junior Member
 
Join Date: Apr 2012
Location: Wisconsin
Posts: 4
Default Hydrostatic fuel gauge innaccurate

Just finished rebuilding fuel system on my 34 and the NOS fuel gauge registers accurate empty but will only go to just above 1/2 when full. I added another calibration rod to the gauge and this made no difference and there is not room for another calibration rod. Also used indicator fluid from two different vendors still no difference will only read just above 1/2 when tank is full. Anybody run into this before?

Robert
34cab is offline   Reply With Quote
Old 07-07-2014, 06:49 AM   #2
Terry,OH
Senior Member
 
Terry,OH's Avatar
 
Join Date: May 2010
Posts: 3,525
Default Re: Hydrostatic fuel gauge innaccurate

The sender in the tank has two cups and a pair of small tubes, one for each cup. It would appear the upper cup is blocked or it's tube. You can use liquid toiler bowl cleaner on the brass it can get into the small tubes, flush (pun intended) it out with lots of water, do not get the cleaner in your eyes or on your skin.
Terry,OH is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 07-07-2014, 01:15 PM   #3
JohnI
Junior Member
 
Join Date: Jul 2014
Location: Vermont
Posts: 8
Default Re: Hydrostatic fuel gauge innaccurate

The liquid in my '34 hydrostatic fuel gauge dried up years ago, and there appears to be sediment in the capillary. Any suggestions what to use to clean it out?
JohnI
JohnI is offline   Reply With Quote
Old 07-07-2014, 03:16 PM   #4
FlatheadTed
Senior Member
 
FlatheadTed's Avatar
 
Join Date: May 2010
Location: Auckland
Posts: 4,262
Send a message via AIM to FlatheadTed
Default Re: Hydrostatic fuel gauge innaccurate

you will need a repair kit from Macs
__________________
http://www.flatheadted.com
FlatheadTed is offline   Reply With Quote
Old 07-07-2014, 10:48 PM   #5
34cab
Junior Member
 
Join Date: Apr 2012
Location: Wisconsin
Posts: 4
Default Re: Hydrostatic fuel gauge innaccurate

Removed tank sending unit and could not find any problems with it. Replaced with a different overhauled tank unit anyway. Same thing reads a little over 1/2 tank when tank is full. Fuel level stays level and does not fluctuate or drop off with time. Could it be the vapor pressure of the gas?
Robert
34cab is offline   Reply With Quote
Old 07-07-2014, 11:01 PM   #6
FlatheadTed
Senior Member
 
FlatheadTed's Avatar
 
Join Date: May 2010
Location: Auckland
Posts: 4,262
Send a message via AIM to FlatheadTed
Default Re: Hydrostatic fuel gauge innaccurate

When the gauge reads empty it should have two gallons in it .at that point you should just see the red liquid appearing
__________________
http://www.flatheadted.com
FlatheadTed is offline   Reply With Quote
Old 07-08-2014, 10:27 AM   #7
keith oh
Senior Member
 
keith oh's Avatar
 
Join Date: May 2010
Location: Millersport, central ohio
Posts: 665
Default Re: Hydrostatic fuel gauge innaccurate

Trouble with the repair kit from Mac's is the red fluid turns clear in a couple of years.
keith oh is offline   Reply With Quote
Old 07-08-2014, 06:35 PM   #8
Ian NZ
Senior Member
 
Ian NZ's Avatar
 
Join Date: May 2010
Location: Taranaki, New Zealand
Posts: 828
Default Re: Hydrostatic fuel gauge innaccurate

Has anybody tried the red fluid from Classic & Exotic apparently it is a higher grade of fluid than Macs but its a lot dearer to.
Ian NZ is offline   Reply With Quote
Old 07-09-2014, 06:00 AM   #9
Terry,OH
Senior Member
 
Terry,OH's Avatar
 
Join Date: May 2010
Posts: 3,525
Default Re: Hydrostatic fuel gauge innaccurate

I believe the calibrating rods act similar to a brick in the toilet water closet. They calibrate the amount of liquid in the tube. If so and you add calibrating rods ,that are not necessary, it is possible for the gauge to run out of stored fluid below the full mark and burp some of the air pushing the red liquid up the glass column. If this happens the gauge would loose calibration and never read "Full" . I would remove any extra calibrating rods in the hex tank (go with one or none as you found it). check calibration on an empty gas tank and add gauge liquid to the 0 line, then fill the tank and see if you have proper reading.
Terry,OH is offline   Reply With Quote
Old 11-09-2018, 11:34 PM   #10
Karl
Senior Member
 
Karl's Avatar
 
Join Date: May 2010
Location: Manawatu, New Zealand
Posts: 1,207
Default Re: Hydrostatic fuel gauge innaccurate

Quote:
Originally Posted by Terry,OH View Post
I believe the calibrating rods act similar to a brick in the toilet water closet. They calibrate the amount of liquid in the tube. If so and you add calibrating rods ,that are not necessary, it is possible for the gauge to run out of stored fluid below the full mark and burp some of the air pushing the red liquid up the glass column. If this happens the gauge would loose calibration and never read "Full" . I would remove any extra calibrating rods in the hex tank (go with one or none as you found it). check calibration on an empty gas tank and add gauge liquid to the 0 line, then fill the tank and see if you have proper reading.
What a great resource Fordbarn is! After 3 years of trying to get my hydrostatic gauge to work correctly I found this post.

To date I have
1. Cleaned and repaired the gauge head
2. Cleaned and repaired the sender unit
3. Replaced the Airline
4. Replaced the fluid with Macs Fluid
5. Replaced the fading Macs Fluid with Classic and Exotic Fluid
6. Replaced the Fading Classic and Exotic Fluid with Original 1934 Factory
NOS fluid
7. Replaced the (Bob Drake) Fuel tank with a Bob Drake tank with the fuel
sender mounting plate from an original tank welded into it to eliminate
the adaptor plate you need to use with the Drake tank for the original
sender
8. Tried about 500 different sizes of brass rod to try and calibrate the gauge

However despite my obvious OCD efforts I could never get the gauge to read over 3/4 full even when the tank was full to the brim.

Read the post above today and removed the calibration rod and the gauge reads perfectly full when full. I need to use the search button more !

Karl
__________________
Such a fine sight to see-Its a Girl, My Lord, in a Flatbed Ford slowin' down to take a look at me.
Karl is offline   Reply With Quote
Old 11-10-2018, 08:22 AM   #11
glennpm
Senior Member
 
glennpm's Avatar
 
Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 886
Default Re: Hydrostatic fuel gauge innaccurate

Hi,


My 32 gauge is giving me trouble too and noticed this article. Can someone post a picture of the calibration rod please? I don't know what you're referring to. My gauge and tank unit is as attached with no mention of calibration rods.


Thanks


fhttp://www.fordgarage.com/pages/32fuelgauge.htm
Attached Files
File Type: pdf Repair - Ford Service Bulletin for June 1932.pdf (276.6 KB, 40 views)

Last edited by glennpm; 11-10-2018 at 08:51 AM. Reason: Add a link
glennpm is offline   Reply With Quote
Old 11-10-2018, 09:47 AM   #12
keith oh
Senior Member
 
keith oh's Avatar
 
Join Date: May 2010
Location: Millersport, central ohio
Posts: 665
Default Re: Hydrostatic fuel gauge innaccurate

Your pictured 1940 convertible does not have a Hydrostatic system.
keith oh is offline   Reply With Quote
Old 11-10-2018, 09:49 AM   #13
glennpm
Senior Member
 
glennpm's Avatar
 
Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 886
Default Re: Hydrostatic fuel gauge innaccurate

I also have a 32.
Attached Images
File Type: jpg IMG_1128.jpg (103.4 KB, 29 views)
glennpm is offline   Reply With Quote
Old 11-10-2018, 09:52 AM   #14
JSeery
Senior Member
 
JSeery's Avatar
 
Join Date: Nov 2012
Location: Wichita KS
Posts: 14,813
Default Re: Hydrostatic fuel gauge innaccurate

Quote:
Originally Posted by glennpm View Post
I also have a 32.
And a nice one at that!!
JSeery is offline   Reply With Quote
Old 11-10-2018, 10:00 AM   #15
glennpm
Senior Member
 
glennpm's Avatar
 
Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 886
Default Re: Hydrostatic fuel gauge innaccurate

Thanks!
glennpm is offline   Reply With Quote
Old 11-10-2018, 10:07 AM   #16
JimG
Senior Member
 
JimG's Avatar
 
Join Date: Aug 2016
Location: Hamburg, NY
Posts: 170
Default Re: Hydrostatic fuel gauge innaccurate

I redid my hydrostatic fuel gauge last year. No new parts - just reused what was there. I took it all apart. The steel enclosure for the gauge was a little rusty near the top of the glass tube, so I soaked it rust 911 for a week and then thoroughly cleaned and dried it and then painted it with rustoleum. I cleaned the glass tube with a Q Tip with most of the cotton pulled off. I also painted the little piece of cardboard that was inside the gauge white, as it was pretty yellowed from age and also stained with red liquid. I used red gauge fluid from classic and exotic. Some people on the barn said to put the red liquid up to the lowest level on the gauge. I used a syringe to put the liquid in after I installed the gauge. This allowed me to remove some liquid after I overfilled it by accident - hard to put the liquid in under the dash and see the level at the same time. I ended up with the level at about the 1/4 mark. I figured this was good as I have read that the liquid does evaporate over time. I cleaned up the end of copper tube good and soaked it in CLR overnight. I them attached the copper tube to the gauge using Teflon tape on the threads. The gauge never goes all the way to full. It tops out at about 3/4 to 5/8. I have learned to just live with it that way. Others I have communicated with on the barn have the same situation. I am satisfied with it.
JimG is offline   Reply With Quote
Old 11-10-2018, 10:28 AM   #17
keith oh
Senior Member
 
keith oh's Avatar
 
Join Date: May 2010
Location: Millersport, central ohio
Posts: 665
Default Re: Hydrostatic fuel gauge innaccurate

JimG- I expect the reason your gauge is not going to the top is probably due to the tiny tube from gauge to tank. It is next to impossible to clean it and usually needs to be replaced and blown clear with a hand pump not with compressor or by mouth. This tube is so small that the smallest amount of moisture or dirt will affect accuracy. Also in order for the gauge to be completely accurate the car must be sitting level. The reason Henry kept using the Hydrostatic gauge is probably the same as why he used cloth insert tops and mechanical brakes. Who knows?
keith oh is offline   Reply With Quote
Old 11-10-2018, 08:34 PM   #18
Karl
Senior Member
 
Karl's Avatar
 
Join Date: May 2010
Location: Manawatu, New Zealand
Posts: 1,207
Default Re: Hydrostatic fuel gauge innaccurate

Quote:
Originally Posted by JimG View Post
I redid my hydrostatic fuel gauge last year. ........ It tops out at about 3/4 to 5/8. I have learned to just live with it that way. Others I have communicated with on the barn have the same situation. I am satisfied with it.
I've heard the same thing from many of my vintage friends - "it's an old car " "Just accept it " I have one of my friends who enjoys rattles and squeaks in his car as it shows him it is vintage

I think we tend to assume that as our vehicles are old they have inherent faults which we should just accept . In actual fact I would wager heavily that when Ma and Pa Kettle forked out their hard earned depression cash to buy a new Ford V8 in 1934 they would have expected an accurate fuel gauge . I am also sure that if they found that it never read over 3/4 full they would have returned it to the dealer for repair or replacement (as we would with a new car today). The fact that Ford sent dealers regular information about how to correct faults such squeaks etc confirms that 1930's buyers were just as picky as us today when it came to their new cars

My approach is if it worked correctly when new there is no reason why it can't be made to work correctly now. How hard you try and how much you spend before you give up is determined by your obsessiveness

Karl
__________________
Such a fine sight to see-Its a Girl, My Lord, in a Flatbed Ford slowin' down to take a look at me.
Karl is offline   Reply With Quote
Old 11-10-2018, 08:37 PM   #19
glennpm
Senior Member
 
glennpm's Avatar
 
Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 886
Default Re: Hydrostatic fuel gauge innaccurate

Very good point Karl.
glennpm is offline   Reply With Quote
Old 11-10-2018, 11:31 PM   #20
deuce_roadster
Senior Member
 
deuce_roadster's Avatar
 
Join Date: Oct 2011
Location: Shelton, WA
Posts: 2,739
Default Re: Hydrostatic fuel gauge innaccurate

I have rebuilt several (>10) 32,33 gas gauges to sell at swap meets and have had them all work fine.
On all of them, I clean them first with lacquer thinner sitting in them for about a week. I then use a piece of .o23 wire from my MIG gun and carefully poke it down from the glass tube side. I have found that most of the clogs are at or very close to the attachment to the glass tube. As stated above, a Q-tip with the cotton removed will fit inside the glass tube and clean it well.
If I can blow air from the brass inlet side (use a syringe, not your compressor when liquid is in the glass tube) and see bubbles in the lacquer thinner, I know that the small brass or copper tube is clear. (I am doing all this with the gauge disassembled and the metering rod intact. Next while holding the gauge in 1 had, I tap the open end of the brass inlet tube with a finger rapidly and see if the liquid (lacquer thinner ) rises in the glass tube. IF it does, I make it go up maybe 1/2 inch and hold my finger tight over the inlet. If the liquid remains at that level and doesn't creep down, I know there are no leaks. All testing and cleaning of the glass tube done with lacquer thinner.
I am VERY fortunate to have a bottle of Ford Script Gauge fluid that is still as red as it was 80+ years ago. The bottle is about 1 1/2" in diameter and 6" high and about 3/4 full. Enough for quite a few gauges.
My first gauge I restored was for my 32 5w worked perfect on my bench. I put it in the car and the red fluid that was on zero disappeared! I took it back out and on my bench it was back at zero. I took a gauge that measures angle and found what angle my dash was at with the car sitting on my level garage floor. Next I held the gauge at that angle and the red fluid disappeared! I put a piece of sheetmetal in my vice and bent it to the angle of the dash in the car, clamped the gauge to it and put drops of the red fluid in it until it read ZERO. Reinstalled it in the car and it has been accurate ever since. I did clean up the tank unit, solder up any cracks in the edges of the chambers that collect air, and install a new air line before I rebuilt the gauge.

SO if your car is on a rake, it will effect your gauge and you need to know the angle of the dash before you zero the gauge with fluid. You can see this if you pay attention to the gauge after you put liquid in it and tip it a little. Anyway that is my 2 cents.

Some gauges where the small tube between the glass and brass fill tube is crushed or clogged and is plugged permanently can be repaired by soldering a segment of good tube in but I have never messed with that, I haven't found that many gauges that I couldn't open up.
deuce_roadster is offline   Reply With Quote
Old 07-09-2020, 05:28 PM   #21
Seabees
Member
 
Join Date: Jul 2017
Location: Eastern Oregon
Posts: 41
Default Re: Hydrostatic fuel gauge innaccurate

Deuce Roadster, are you still in possession of some of the gauge fluid? If so, would you be willing to part with enough to do my gauge? I am working on a '32 BB truck for a farm family who bought it new, way back when. It's a typical farm truck, beat to hell! I would really like to talk to you about how you repaired the gauge also. I'm in Pendleton (Or). Send me a message if you'd like. Thank you sir!
Seabees is offline   Reply With Quote
Old 07-11-2020, 12:50 PM   #22
BoxCar Tom
Senior Member
 
BoxCar Tom's Avatar
 
Join Date: May 2010
Location: Basking Ridge, NJ
Posts: 322
Default Re: Hydrostatic fuel gauge innaccurate

Try this

https://straight-eight.com/product/k...uge-red-fluid/
BoxCar Tom is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 07-11-2020, 05:03 PM   #23
JimG
Senior Member
 
JimG's Avatar
 
Join Date: Aug 2016
Location: Hamburg, NY
Posts: 170
Default Re: Hydrostatic fuel gauge innaccurate

BoxCar, I looked online and this is the same fluid from Classic & Exotic. Sounds like they are winding down their business and selling inventory through Straight Eight. I used the Classic & Exotic fluid but the color has faded after a couple of years and my car is always stored on a garage so it is not out in the sunlight often.
JimG is offline   Reply With Quote
Old 07-11-2020, 05:37 PM   #24
Brian
Senior Member
 
Brian's Avatar
 
Join Date: May 2010
Location: Masterton, New Zealand
Posts: 2,791
Default Re: Hydrostatic fuel gauge innaccurate

The original [tetra-bromo-ethane] liquid was tinted with 'Durant scarlet dye'. when your repop liquid fades out, try adding a drop or two of cochineal red food colouring....
__________________
Unfortunately, two half wits don't make a whole wit!
Brian is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 03:05 PM.