Lil Roger

I have a 1989 F150 4X4 with a 4.9 lt six banger. This truck has been sitting for about a year and I bought it and put I clutch kit in it. I drove it about a hundred miles and the problem has got worst. Once the truck gets hot it acts like it is running out of fuel. I check the fuel pressure this morning and with the motor not running it checks about 10 psi. If I crank the engine the fuel pressure goes to about 46 psi. If I ground out the test circuit and let the pump run it goes to about 60 psi. I can feel the fuel pump relay cutting on and off. I have checked the codes with a obd 1 tester and it codes out system pass.

Thanks Roger

Fast Hampster

46 PSI seems to be normal. I guess it's not about fuel pressure. Have your ignition control module checked. By the way - have you checked for pressure when it starts to "run out of fuel" or before you let it warm up ?

Good old Bill

10 PSI is "no bueno", need the same 30-40 running. Pull off the vac line at the regulator, am realy interested if fuel is present at the port. Should be no fuel.