HELP truck dieing
 

I have a 1985 350 carburetor truck with duel tanks I have replaced the fuel pump - sending units- transfur valve - and all the hoses truck runs great and randomly dies I have a clear fuel filter and it is empty and will not start if it seats for a day or two it will start

Re: HELP truck dieing
 

Three things to check IMO it is easy to pinch the fuel lines above the tanks when re-installing them vented gas caps may be plugged may be sucking air into the lines somewhere causing no fuel to be pumped

Re: HELP truck dieing
 

If during the sender and hose replacement, you deleted the charcoal canister and plugged those lines, the tanks won't have a vent. The stock gas caps are not vented. Pre-canister tanks had a small plastic vent cap on a short piece of hose.

Mice will sometimes nibble holes in gas lines letting air into the system.

Don't assume the new fuel pump is problem free. QA isn't what it used to be.

Re: HELP truck dieing
 

yes the canister was all deleted the fuel pump has the feed line and the return line if I clamp off the return line it gets fuel to the filter and starts

Re: HELP truck dieing
 

I have duel tanks, if I remember right years ago I popped a fuse and it killed the transfer switch. check that out. Been 20 years

Just a thought

Re: HELP truck dieing
 

What shape is the ignition system in? A failing distributor module could also have similar symptoms when the module heat soaks.

Re: HELP truck dieing
 

If you connect a Mity Vac to the fuel inlet line you can see how easy it is to pull fuel. If there is a pin hole you should hear it hissing. If fuel flows easily then your fuel pump is too weak

Re: HELP truck dieing
 

Sounds like the tank can’t breathe and is pulling a vacuum.