86 Bronco II 5 psi Fuel preassure

[forman621]

Ok my truck runs at about 31 or 32 psi and runs and drives ok. then sometimes when under load and at operating temp it cuts out barely runs and the fuel preassure goes to 5 psi and sits there until it figures out how to fix itself or the connections gets better. i have relplaced the high preassure fuel pump already and didnt do anything.

1. voltage at pump is 12.8 v
2. voltage after inertia switch is 13.5
3 before switch is 14.02
4 and at the fuel pump relay 14.3 at al contacts ecept the ground which also has good connection.

What is going on I really need some help.
Thanks

[Ranger Dave]

low preasure pump??? filter in the canister clogged.

if you let it idle for awhile the presuure biulds up??

[milwaukeeace]

I'd replace both filters first to see if there's any improvement. If not, I would replace the pressure regulator. It's more likely that the regulator would fail than either pump. If you do end up replacing the pressure regulator, be sure to shop around EVERYWHERE you can! Prices vary greatly. Here in Milwaukee I found the same part range from $27 to over $100.

[forman621]

hey i tested the rear pump and hooked up 12 volts to the conection in several places and could not get the fuel pump to run so i am going to go buy a pump and seew what happens now.