I have 1978F-250 it sat for 3 yrs gas was sperstic to carb cleaned tank new fuel pump and still same now new tank new sending unit and fuel line clear filter put on but shows gas speratic but when I remove filter plenty pressure and fuel could it be the carb

undo all the fuel lines and vacuum lines, electrical connectors to the fuel tank. undo the fuel filler tube at the tank. support the gas tank as it will be heavy depending on how gas is in it. undo the fuel tank straps and lower the tank. clean the area around the sending unit of dirt and remove the lock ring that holds the sending unit into the tank then you can remove the sending unit to replace the pump. follow the instructions that came with the new pump. don`t use a used pump and change the fuel filter.

disconnect the electrical connections and fuel lines and vent lines at the tank then disconnect the fuel filler hose from the tank. support the tank then undo the fuel tank straps then lower the tank down to the ground. be careful as the tank will be heavy depending on how much gas is in it. clean the area around the sending unit. there is a lock ring that holds the sending unit assembly in the tank that needs to be removed then you can pull out the unit. at the bottom of the sending unit is the fuel filter. follow the instructions that came with the new fuel pump.

I would check the fuel lines where they attach to the sending unit. The rubber inside of the nylon weave is probably rotten and sucking air instead of pulling the fuel up and out of the tank.

If you take the fuel line off at the carb and crank the engine, does the pump push fuel out of the line ?

There are several issues that can cause this. (1) Fuel Pump which is located on the sending unit in the case tank. (2) debris in the gas tank causing causing the debris to wrap around the boot or the sock (3) clogged catalytic converter (4) misfire of a plug or simply a bad plug (4) speed sensor (TCM) (5) bad air filter

Fuel Pump Assembly from a wreck ($60) plus install or new about $350 installed, cleaning of the gas tank ($90) or new gas tank $300 installed or used gas tank from wrecker ($125), plugs ($90 plus install), TCM speed sensor $250 installed (dealer only) and bad air filter ($20 easy install)

if it is fuel inj. check for good fuel pressure. maybe fuel pump in gas tank.

The age 1986 warrants a fuel pump replacement. Check for rodent damage in the fuel tank harness area when you install new pump. Also change the fuel filter.

hello, usually when gas sets in carb for a long time it turns into a varnish, you will have to take carb apart and clean all jets out, even the fuel pump may be clogged up, you will probably have to rebuild carb, unless you have access to air line to blow any and all jets, pretty much all passage ways, power jets, in other words you have a carb problem, you may need a new one, unless you have a strong solvent, that will break away any varnish or gum up.

Wes, try checking your float in your tank, or check the sending unit.

yes it is probably the pump or a problem in one of the fuel lines but i would bet more on the fuel pump or suction line into the tank. If you can take the line off going to the tank put it in a jug of gas and see if the pump will pump it to the carb or the engine will run.