More issues, fuel maybe? Carb?

[Vanspeed]

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.

[George/Maine]

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.

[Vanspeed]

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

[Tbud]

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

[FlatheadTed]

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

[Vanspeed]

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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.

[Ross F-1]

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.

[f1builder]

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.

[waterboychuck]

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

[Vanspeed]

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.

[FortyNiner]

Yup, fuel line.

[JSeery]

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.

[George/Maine]

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.

[Walt Dupont--Me.]

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

[choppedtudor]

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.

[JSeery]

Originally Posted by Walt Dupont--Me.

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

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.

[39topless]

Originally Posted by JSeery

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.

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

[krackerjack1951]

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

[Vanspeed]

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.



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

[George/Maine]

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