i have a 86 lariat efi 302 and the fuel pump works its just not getting gas to the engine. the fuel pump is on the frame. iv checked my gas lines and there not cloged.so i anybody my now what the problem is then your help would be appreciated.

 

I am probably mistaken but I think the fuel pump is in the tank and the filter is on the frame. I would change the filter on the frame. Just behind the cab. Drivers side.

 

I believe "arctic y block" is correct. I would start with the filter for sure. It is a lot cheaper lol.

 

Than the pump that is....

 

That truck has a pump in the tank, a pump on the frame, and a filter on the frame...

 

Pull the incoming line of the filter than and turn on the key. If no Fuel and the pump on the fram is working than the one in the tank ain't. If it pumps out fuel than ya know it's the filter.

 

On my 86 I also ran into a problem with the filter on the selector valve on the frame rail, it is in an oil filter shaped bowl on the bottom of the valve that screws off. My truck has dual tanks, but If I remember right the single tank trucks still have this "valve" but with less ports, its main function is to serve as a reserve bowl for the high pressure pump as there are no baffle pans in the tanks. NAPA carries this filter under part# FIL3268, it is a round cartridge filter they were the only ones that crossed the OE# of E6TZ-9365-A correctly. Even Motorcraft crosses the number to the inline filter and most dealers are unaware of this filter. I was suffering from fuel starvation problems and my front was groaning so I changed it and still had the issue. I found this filter with help from my dad, he had run into it before. Not saying it is your issue, but it could help as it has probably never been changed due to it's nature. Good Luck!!

 

You said the pump is working but you are getting no fuel? How do you know and where did you check?

If you know the pumps are working but you checked for fuel at the air valve looking thing on the fuel rail, then start checking for fuel further back like at the filter, before the tank switch (if you have dual tanks) and at the tank itself.

You could have a bad pressure regulator if you have fuel all the way to the filter but not at the fuel rail.

You could have a bad tank selector switch if you have fuel to there but no further.

If you don't have fuel out of the tank but can hear the pump working, then either the pump is running but wore out or more likely, the little rubber hose that connects the pump to the assembly that has the fuel line out of the tank is eaten away. That happened on mine and more common in California than most of the rest of the country though it does happen everywhere. In California, they used MTBE as a gas additive and it eats rubber. My pump was fine but the 3" rubber piece that connected it to the fuel line was rotten.

The low pressure pumps and that rubber pece are in the fuel tank so you will either have to drop the tank to change them or else lift the bed off and get to them through the top. Your choice, I don't mind dropping tanks and can do it quickly but others hate it and prefer to take their beds off and do it that way.

Good Luck,

Lee