E-150 Good fuel pump won’t turn
Thread Starter
|
Mountain Pass
Joined: Jan 2022
Posts: 117
Likes: 27
E-150 Good fuel pump won’t turn
I’m troubleshooting a friend’s 2001 E-150 with a 5.4. She reports it cranked but did not start a few days ago, and hasn’t started since. Here’s what I’ve done:
I couldn’t hear the pump run when the key was turned. At this point I located the inertia switch, which appeared to be closed. Jumped 87 to 30 terminals to simulate relay closing. This caused the pump to turn on. The engine started and ran normally when cranked with this jumper in place.
I bench tested the relay using the battery directly (about 12.3 volts). The relay tested good using the battery to activate it.
I checked for voltage at the fuel pump relay terminals. I detected about 11.3-11.4 volts from 87 to 30. When the key was turned to on, I detected the same voltage between 85 and 86.
If jumping 87 to 30 runs the pump, and the relay is getting voltage, and the relay tests good, am I correct in suspecting that the relay simply is not getting enough voltage to close the circuit?
What voltage should I be seeing at the fuel pump relay? Is the tested 11.3 volts not enough to energize the relay? A sign of a bad ground? Or am I missing something else here?
Thanks,
Luke
I couldn’t hear the pump run when the key was turned. At this point I located the inertia switch, which appeared to be closed. Jumped 87 to 30 terminals to simulate relay closing. This caused the pump to turn on. The engine started and ran normally when cranked with this jumper in place.
I bench tested the relay using the battery directly (about 12.3 volts). The relay tested good using the battery to activate it.
I checked for voltage at the fuel pump relay terminals. I detected about 11.3-11.4 volts from 87 to 30. When the key was turned to on, I detected the same voltage between 85 and 86.
If jumping 87 to 30 runs the pump, and the relay is getting voltage, and the relay tests good, am I correct in suspecting that the relay simply is not getting enough voltage to close the circuit?
What voltage should I be seeing at the fuel pump relay? Is the tested 11.3 volts not enough to energize the relay? A sign of a bad ground? Or am I missing something else here?
Thanks,
Luke
Thread
Thread Starter
Forum
Replies
Last Post
LukeIDI
1968-Present E-Series Van/Cutaway/Chassis
5
Jan 23, 2022 04:00 PM
