96 E350 5.8 Engine keeps dying.
Thread Starter
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Mountain Pass
Joined: May 2011
Posts: 133
Likes: 8
I have a pressure gauge and I'm only getting 14psi. I just checked the voltage at the pump connector and I am only getting 6.8 volts, so this is an electrical problem. I have 12 volts at the pump relay, and the next down stream item is the Inertial switch. I am getting only 6.8 Volts there as well. Something is pulling my voltage down between the relay and the Inertial switch, probably a bad connector I'll need to track down. Strange thing though.. when I turn on the key the voltage jumps to 12 volts and then immediately drops to 6.8. I don't understand that at all
Thread Starter
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Mountain Pass
Joined: May 2011
Posts: 133
Likes: 8
I thought about the ground so I grounded the pump ground to the chassis and it made no difference. Can't be the ignition switch because I get 12 volts to the fuel pump relay. I'd like to make sure it's not the relay. I wonder if the other two relays close to it are the same configuration? If they are I could try swapping the Fuel relay with one of those and see if it makes a difference. There is an ABS relay in the fuse box but I only have two wheel ABS. The only ABS relay I can find in the wiring diagrams is for 4 wheel ABS, so that may not be used for anything.
Last edited by David40; Jan 24, 2026 at 07:35 PM. Reason: More Info
Thread Starter
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Mountain Pass
Joined: May 2011
Posts: 133
Likes: 8
What do you all think of this? How about I put a tap connector on the pump power wire and run a wire to the dashboard, a switch, and then to a 30 Amp inline fuse to the battery? For one thing it would tell me right away if the pump is working, I could actually use the van and use that as a workaround while I try to figure out where a resistance is only letting 6.8 volts through on the existing line.
Thread Starter
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Mountain Pass
Joined: May 2011
Posts: 133
Likes: 8
Thanks for that info. It will be an ongoing search to find that location. In the mean time I did the wire and switch to put 12 volts on the pump. When I turn on the switch I can actually hear the pump running. I started the engine and everything was running perfect. So I left it running and put everything away. By the time I got back and the engine was warming up it started to do the same thing, running like crap and stalling at idle. The pump was still running and I could turn it on and off but it didn't help. I figure next I will check the fuel pressure. What a pain....
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Hotshot
Joined: Jul 2020
Posts: 10,572
Likes: 2,678
From: Near Salt Lake City
A 1997 EVTM should show the exact location
I'm working on a 1990 Country Squire right now chasing a bad splice on the self test wire for the ECM
Luckily, I have a 1990 Crown Vic EVTM that shows the splice locations
I'm working on a 1990 Country Squire right now chasing a bad splice on the self test wire for the ECM
Luckily, I have a 1990 Crown Vic EVTM that shows the splice locations
Thread Starter
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Mountain Pass
Joined: May 2011
Posts: 133
Likes: 8
I do but what I am doing at this point bypasses all of that. I am running 12 volts directly from the battery to the fuel pump. The pump runs but I am unable to get any fuel pressure reading at all.
Thread Starter
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Mountain Pass
Joined: May 2011
Posts: 133
Likes: 8
UPDATE: Besides the wiring problem I have determined the Fuel Pump is dying. It's under warranty and I am having it towed to my local shop. To make it real easy I cut out the floor above the pump. Shouldn't take but a half hour to swap it out.
