More issues, fuel maybe? Carb?
 

Ok so started the f-1 and let it run for about ten minutes. My neighbor and I took it around the block. Kinda sputters when you first hit the gas. Then after about 20 minutes she died. Hard to get it started again but when it starts it idles. If I hit the gas it dies. New fuel pump, new leather accelerator pump. It will only idle now, had to tow it home. The minute you hit the gas to take off it dies. Is it a problem in the carb? My fuel pump is pumping.

Re: More issues, fuel maybe? Carb?
 

I had a problem like yours and took the tank out and flushed it out.
Make sure the line is clean. Watch out for the shut off they can broke off.

Re: More issues, fuel maybe? Carb?
 

I thought of that but my inline filter is still clear. Why would it completely die when I hit the gas?

Re: More issues, fuel maybe? Carb?
 

Sounds to me like dirt in the bowls and it rises when you accelerate. Had a similar problem.

Re: More issues, fuel maybe? Carb?
 

It could be electrical but most likely crud in the secondary jets ,strip the carb and blow it all out with 100 psi .

Re: More issues, fuel maybe? Carb?
 

I think you guys are right. I went out to lunch with my wife and let it completely cool off. I started it up and it idles fine but now hesitates, sputters, etc when you give it gas so I do think the carb is either got crap in it or something. Taking it off to do a tear down.

Re: More issues, fuel maybe? Carb?
 

The fuel line is the low point of the system on F-1's, so all the rust particles collect right about where the line turns to come up the firewall. My filters were clean but it couldn't get fuel after a short run. I took the line out and beat on it, about a 1/2 pound of crap came out. And it just kept coming, so I replaced the line. No problems since.

Re: More issues, fuel maybe? Carb?
 

make sure the breather is working right. my 47 did that too and i had used the red k&n spray on my paper filters, not thinking, and it wouldn't run. changed filters and it run like a top. simple but dumb mistake.

Re: More issues, fuel maybe? Carb?
 

You mentioned that you put in a new leather accelerator pump. Have you rebuilt the entire carb? How is the timing?

Re: More issues, fuel maybe? Carb?
 

All I did to the carb was check it out, it was super clean so I just put a correct rebuild kit in it. I think it needs a whole tear down.

Re: More issues, fuel maybe? Carb?
 

Yup, fuel line.

Re: More issues, fuel maybe? Carb?
 

Would be a lot easier to check out the fuel line (tank to fuel pump) first I would think. Sounds easier than taking the carb apart until you sure that's where the problem is.

Re: More issues, fuel maybe? Carb?
 

Most cars the gas line sucks from top, the f1 drains from bottom and any dirt on bottom is hard to remove. If all else fails remove tank and flush.

Re: More issues, fuel maybe? Carb?
 

It seems if you remove the fuel line from the carb and crank the engine and it pumps gas into a coffee can it will tell you something. Another thing few think about, the primary wire under the breaker plate in the dist has a habit of chaffing, and every time the vacuum chamber moves the breaker plate the engine shorts. Now I'll eat my banana. Walt

Re: More issues, fuel maybe? Carb?
 

This is pretty basic but are the mixture jets screwed in all the way? If so back them out 1 1/2 turns for a starting point.

Re: More issues, fuel maybe? Carb?
 

And/or connect a fuel pressure gauge. That would also allow you to see what the pressure is doing with the throttle open. I've been told that savvy flathead guys can tell a lot from just cranking the engine with the carb line off. Me, I need something I can read LOL.

Re: More issues, fuel maybe? Carb?
 

Good advice. A pressure (vacuum) gauge is a great diagnostic tool and will run you only 25-30 bucks.

Re: More issues, fuel maybe? Carb?
 

run a gas jug to your pump at the pump..see how it runs.. if it runs good ,,clean out the trap in your shut off line at the tank

Re: More issues, fuel maybe? Carb?
 

Today after work I decided to just take out the entire fuel system since that is one area that I really didn't touch. The last owner said he cleaned out the tank so I took his word for it. Lots of crap in the steal line. The inside of the tank has this "stuff" in it. You can scrap it off, and it is a black grainy type of substance. I pulled the shut off valve out and it appears to have cuts in it?? I called a shop and they wanted 525.00 to re-new the tank. Anybody have any other ideas on how to clean it up inside? Something that won't break the bank? I am going to replace all the lines with new ones. Is my shutoff valve ruined?

The shutoff valve after a cleaning, it was coated in the black stuff too.

http://img.photobucket.com/albums/v1...psikpfnjdo.jpg

The black stuff after it dries. It's like a crystal like sand.

http://img.photobucket.com/albums/v1...psgxpvubuh.jpg

Re: More issues, fuel maybe? Carb?
 

If you have the tank out I flushed mine with water and the cuts look to be to let fuel better flow.

Re: More issues, fuel maybe? Carb?
 

Yes gas tank is out. I heard that denatured alcohol works, has anybody tried that? Water alone does not look like it will do much.

Re: More issues, fuel maybe? Carb?
 

There is supposed to be a bronze screen inside the tube on the valve.

I'd honestly buy a brand new tank. Very reasonable and made to handle gasohol. Why fight it?

Re: More issues, fuel maybe? Carb?
 

I've had to replace the tanks on my trucks, they were a mess inside. I have cleaned and sealed tanks as well. It is a lot of work and takes a lot of time, but it can be done. Also, the chemicals are not cheap!

Re: More issues, fuel maybe? Carb?
 

Eastwood sells a kit for around $80.00 when I bought mine a year ago for the 34 roadster. They had a sale going. Has everything you need to clean & seal your tank. They also were an alliance(HAMB thing) but it didn't apply to the tank kit as it was on sale. Just took me a couple of days mostly letting it soak. Been in there for a year or so & sits for 6 months with that s*** they cal motor fuel. So far the sealer is holding up. The tank had rodent nests & rust when I got the car.

Re: More issues, fuel maybe? Carb?
 

Here ya go on Amazon. You folks need to learn how to use GOOGLE. Sure would save you a lot time.
POR-15 49239 Auto Fuel Tank Repair Kit



by POR-15

4 customer reviews




List Price: $86.70 Price: $67.18 + $8.95 shipping You Save: $19.52 (23%)

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Only 5 left in stock.
Ships from and sold by ecustomhitch.



Estimated Delivery Date: June 15 - 18 when you choose Standard at checkout.

• MARINE CLEAN to remove gum, sludge, varnish
• METAL READY to remove rust and prepare tank for sealer
• U.S. STANDARD TANK SEALER creates a permanently sealed tank
• BRUSH for applying patching system to exterior of tank
• DETAILED INSTRUCTIONS to take you easily through each step of tank restoration

Re: More issues, fuel maybe? Carb?
 

Yeah no rodent nests here, the tank for the most part looks good, just not the bottom three or so inches. I want to try and clean it first before replacing it.

Re: More issues, fuel maybe? Carb?
 

You can buy most of the chemicals at a hardware store cheaper than the kits IF you are just interested in cleaning it. Lots on information online on what and how. The sealer is a different matter.

Re: More issues, fuel maybe? Carb?
 

You could try one of those self car wash high pressure and stick it down bottom and get all loose dirt and put a filter in line. If it rust its for ever new tank.

Re: More issues, fuel maybe? Carb?
 

The baffles in a gas tank make it really hard to clean all the little nooks and crannies. I would go with a new tank and never have to worry about it again.

Re: More issues, fuel maybe? Carb?
 

Long ago someone here said E85 gasoline (85% alcohol) worked well to remove the old gum. Cheaper than buying cans of alcohol.

Lonnie

Re: More issues, fuel maybe? Carb?
 

New tank at LMC is $199 if you are interested in a reference point.

Re: More issues, fuel maybe? Carb?
 

If you do go with a new tank, consider adding a return line fitting.

Re: More issues, fuel maybe? Carb?
 

Why would you want a return line on a low pressure system?

Re: More issues, fuel maybe? Carb?
 

See G.M.'s experiments on preventing vapor lock. Circulating the excess fuel back to the tank helps keep the pump cool with the stock mechanical pump. If you are using an electric pump with regulator, having a return line from downstream of the regulator really helps maintain a steady pressure.

Re: More issues, fuel maybe? Carb?
 

I use return lines on all of my high pressure installations, but seems like overkill on a low pressure setup. Vapor lock should not be an issue on a flathead with an electric pump. The pump is pushing the fuel not pulling it (assuming the electric pump is mounted low and near the tank). It is the pulling on the fuel that is the major component in vapor lock. The stock pump is mounted high in relation to the fuel tank and has to pull the fuel up to the pump. Add in the heat where the pump is located and it is an ideal setup for vaporizing the fuel.

Re: More issues, fuel maybe? Carb?
 

With an electric pump the issue is more about keeping the regulator within its setpoint. They don't do well dead-headed. But electric pumps are also cooled by fuel flow, keeping a minimum flow helps them.

My point is, if you have a new tank, it's easy and cheap to add, even if you don't end up using it. Once the tank has had gas in it, a much bigger deal.

Re: More issues, fuel maybe? Carb?
 

I agree Ross, easy job on a new tank, be almost silly not to. As you stated, a return line will be of benefit wether leccy pump or mechanical.
Martin.

Re: More issues, fuel maybe? Carb?
 

You don't need to run the small return line to the tank. I run mine high up in the filler neck. The other tube seen in the picture is the original vent line.
You could "T" into that but I prefer the way I did it, you can look down the filler pipe when it's running and see the fuel returning. I think on this one I used brake tubing with about a .120 orifice to control the amount of fuel returned. To small of a return and the cooling effect may not enough, to large of a return and the carb will run out of fuel at high speeds. G.M.

Re: More issues, fuel maybe? Carb?
 

G.M., on an F-1 the tank is in the cab, and the filler mostly is too. I've thought about adding your kind of return in the filler pipe, not sure I want that kind of plumbing in the cab...

Re: More issues, fuel maybe? Carb?
 

Not going with a new tank yet. I spent the day after work on it for about an hour. Amazing how much I got out. I have a plan for the remaining crap. This truck is an all original truck so I am keeping everything I can.