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05-14-2018, 10:02 AM | #21 |
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Re: Fuel boiling at fuel pump
Lawson Cox
I had bought the adjustable electric fuel pump from a local auto parts store about 25 years ago. I since have sold the truck , but I am sure a guy could go their favorite parts store and even order one , or go on line. I am sure they are still available . Vic |
05-14-2018, 10:06 AM | #22 | |
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Re: Fuel boiling at fuel pump
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05-14-2018, 10:46 AM | #23 |
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Re: Fuel boiling at fuel pump
JT- Here in NW Illinois non-ethanol is pretty readily available. On most pumps, the 87 and 89 will say "10% ethanol added" and the highest octane (91 or 93) will either say "no alcohol added" or just say nothing. Not sure what the availability is down south where Seth is.
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05-14-2018, 12:58 PM | #24 | |
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Re: Fuel boiling at fuel pump
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05-14-2018, 01:27 PM | #25 | |
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Re: Fuel boiling at fuel pump
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Bummer. I guess that's one advantage of N IL. (Another being a few degrees cooler) ;-)
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05-14-2018, 01:27 PM | #26 |
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Re: Fuel boiling at fuel pump
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05-14-2018, 01:44 PM | #27 |
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Re: Fuel boiling at fuel pump
I think this will help. Although I'm not sure it will completely remedy this situation.
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05-15-2018, 12:28 PM | #28 |
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Re: Fuel boiling at fuel pump
Another thought is the heat soak the fuel pump takes after you have driven on a hot day and shut the engine down. The heat soak is causing fuel to boil at the pump. How do you combat that problem? We can take steps to keep fuel cool while running but what do you guys do when you park and the engine does not have enough time to fully cool to a point that the fuel is not vaporizing?
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05-15-2018, 05:42 PM | #29 |
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Re: Fuel boiling at fuel pump
Seth, you've posed a very interesting question. The heat soak or sink does heat the pump as it sits after shutdown. But it seems to me that it's the vapor block "lock" that's in the lines before and after the pump that's keeping fuel from getting to the carb. The pump pumps as the engine turns over, but the fuel in liquid form can't get past the vapor barrier. That's why the electric pumps give that extra push necessary to break up the vapor barrier.
So the point you've raised is that the hot pump also vaporizes the gas so it can't move fuel in liquid form up the line toward the carb, despite the fact that it's "going through the pumping motions". I'm interested, too, in hearing what others do...in addition to the ice packs, clothes pins etc. We have the perfect setting here in southwestern AZ to test almost all solutions to dread vapor lock stranding!!! Dick. |
05-15-2018, 06:39 PM | #30 | |
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Re: Fuel boiling at fuel pump
Quote:
Since I'm in the cold north, it takes my carburetor 20-30 minutes to heat up the carburetor to really preform well, find myself messing with the choke for a few miles. So out they go. Guess I'll see. . Last edited by Tinker; 05-15-2018 at 06:48 PM. |
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05-15-2018, 07:26 PM | #31 | |
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Re: Fuel boiling at fuel pump
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John "Never give up on what you really want to do. The person with big dreams is more powerful than one with all the facts". Albert Einstein Last edited by JM 35 Sedan; 05-16-2018 at 11:28 AM. |
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05-15-2018, 10:38 PM | #32 |
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Re: Fuel boiling at fuel pump
I never saw this installation, so this is a second hand report of a vapor lock solution: A friend reported that he had used a 1/8" fuel return line back to the tank, to provide a constant replenishment of cooled fuel to keep the pump free of vapor lock. To me, that seems like a good idea to prevent stop-light vapor lock, but a lunch stop would put you back to square one.
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05-16-2018, 10:18 AM | #33 |
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Re: Fuel boiling at fuel pump
There have been several past threads on using a return line. Can't remember if they were on the Barn or HAMB.
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05-16-2018, 11:00 AM | #34 |
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Re: Fuel boiling at fuel pump
.... I was going to ask if you run a glass bowl pump, I see you do run a sediment bowl fuel pump.
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05-16-2018, 11:32 AM | #35 | |
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Re: Fuel boiling at fuel pump
Quote:
What is interesting regarding our Ford vehicles is that I’ve never had a vapor lock on the truck and after reading this thread think that the reason is the fuel tank in the tonner is in the cab with a relatively short fuel line from the tank to the pump so there isn’t as much chance for heat buildup in the fuel lines as on the passenger cars and the airflow thru the engine compartment on the truck is also more unobstructed with very large openings in the inner fenders to allow air to flow past the engine. |
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05-16-2018, 01:03 PM | #36 |
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Re: Fuel boiling at fuel pump
I believe G.M. was experimenting with a return line at one time. There are a lot of technical things to consider when engineering a return line. Perhaps G.M. may chime in here and opine?
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05-17-2018, 12:22 AM | #37 |
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Re: Fuel boiling at fuel pump
The former owner of my '47 installed (1) the foam & foil heat shield wrap on the gas line leading to the mechanical pump, (2) an electric Airtex emergency/starting pump at tank, and (3) substituted a six-blade truck fan for the stock four-blade fan .... it moves a lot of air thru the engine compartment but is noisy at high rpm i.e. in first and second gear.
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05-17-2018, 10:05 PM | #38 |
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Re: Fuel boiling at fuel pump
Hi Seth, On days when I'm concenred about vapor lock, I park with the hood open when I know I'm going to be moving again soon.
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05-17-2018, 11:15 PM | #39 |
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Re: Fuel boiling at fuel pump
I'm going to make a very uneducated assumption. So octane is around 89-91 now. In the 30's around 50-60? How much could that make a difference to it's stability?
Non Eth has been good to me however. |
05-18-2018, 10:17 AM | #40 |
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Re: Fuel boiling at fuel pump
Tinker, Low octane has its own set of problems, but in this modern world, we're dealing with another set of problems that comes with the oxidants incorporated in gasoline to improve air quality. The condition that affects us most is the high volatility of gas today. Just look at it crosseyed and it evaporates, leaving you with an empty carb bowl, or a vapor locked fuel pump.
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