CaptainBob

The ballast resister reduces the voltage to the fuel pump in the engine running mode to reduce noise and make the pump last longer. This I learned from one of the members here in a private mail. You can jump the resister to test for power at the pump but I wouldn't change the design of the system unless you don't want to spend the few bucks on a new one. Captain Bob

After replacing the ballast resistor, I now had power to the pump but no fuel pressure to the rail. Found it was the fuel pressure regulator and after replacing it, the truck runs great. Too bad the previous owner didn't do the repairs as he went along instead of letting them accumulate to create a nightmare. Oh well, I got a good deal on a rust free Larado that now runs like a top and life goes on.... A note: When I first started diagnosing the fuel problem, I pulled the pump mechanism from the tank and found that the hose between the pump and the supply line was almost disconnected. Looking back now, I am sure when the pressure regulator failed it caused the hose to blow off. I wonder if it was then that the resister was overheated too...... Appreciate the welcome to the club! Great place! Now that my son has his Comanche, I feel left out...maybe I will get one too...a 4X4 would be nice :D Thanks again, Captain Bob

Hi, I am new to the forum and have a problem I cannot seem to cure. The fuel pump has no power to it. I have done extensive testing of sensors and have replaced the idle control valve, the throttle position sensor, all 5 relays, a bad ignition switch and key cylinder, the fuel pump, and traced the wiring back to the relay to be sure there was no fault. The truck was finally running good and idleing properly. After driving about 30 minutes on the highway, the new fuel pump died and would not start again The pump runs on the ground when tested. In the truck, the fuel pump relay clicks on and the pump starts for a second then stops...as it is supposed to. I understand the computer must sense the car is running or being started for the pump to run again. It never runs. Is there a fuel pump cutoff or an inertia switch on this truck? Does anybody know if and where a fuse link might be. What am I missing? There is nothing left but the computer that I can find. Thanks for any help you can give. Captain Bob