Fuel problem

mark's 1984 said:

have never noticed a vacuum in the tanks.

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Sorry, I don't know what you mean by that. Did you try running without your fuel caps on?

mark's 1984 said:

One auto tech said it sounded like a fuel line was collapsing, but all rubber lines have been replaced.

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Even if the lines are new, given sufficient vacuum, they can still collapse.


If you don't have fuel in the filter when it dies, you are clearly having a fuel delivery problem.

mark's 1984 said:

I have now installed an electric fuel pump that helps it from stalling, but has not solved the problem.

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This would suggest to me, the new pump is able to help compensate for the problem. It is also the reason I want to be clear about the fuel cap; If you are creating a vacuum in the tanks, a stronger pump would potentially allow it to run a little longer.

Did this problem occur on both tanks simultaneously?

mark's 1984 said:

after driving for maybe 5-10 minutes, the engine will surge (like the metering valve sticks wide open) for a few seconds. within 20 seconds the truck will start to lose power and the engine will shut off.

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Does it have this problem when held at a fast idle?

Zork said:

I am saying if the schrader was leaking, you should develope your symptoms withing a matter of two minutes (after sitting over night)

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I believe LMJD was not suggesting Mark check the schrader valve, rather he was suggesting Mark use the schrader valve to check the fuel pressure in the system; much like you would use the schrader valve on a tire to check the air pressure in the tire. (Although, we have since found out he no longer has the schrader valve.)