Efuel Pressure Issue
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Cargo Master
Joined: Feb 2010
Posts: 2,526
Likes: 6
From: College Station, TX
Efuel Pressure Issue
I got to where the gauge on my FPR was sitting on zero and the truck wouldn't run well. This happened one year ago and it ended up being pieces of plastic from disintegrated fuel pickups in the tanks obviously blocking the feed line. I dropped both tanks this week and though the pickups had fallen off again they weren't in pieces and the lines were clear. Either way I just extended the feed with a union and tubing and reinstalled everything. The truck cranks and runs but still shows 0 psi at the fuel gauge. If I run a wire from the pump positive to the battery the pressure jumps right to 60 psi which is where I set it years ago. This is whether engine running or not. It appears the pump is not actually running or at least is not running well on it's native power source. Any ideas where to keep looking?
I checked the pump terminals and everything is tight. It's running through a factory relay installed in the power distribution box. Swapped relays and no change. The 20A maxi fuse installed in the PDB is still good. I have an oil pressure switch installed but from what I know it is binary and the pump shouldn't run without a reading. Just looking for more ideas. Again, the pump seems to run fine wired straight to the battery...
I checked the pump terminals and everything is tight. It's running through a factory relay installed in the power distribution box. Swapped relays and no change. The 20A maxi fuse installed in the PDB is still good. I have an oil pressure switch installed but from what I know it is binary and the pump shouldn't run without a reading. Just looking for more ideas. Again, the pump seems to run fine wired straight to the battery...
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Cargo Master
Joined: Feb 2010
Posts: 2,526
Likes: 6
From: College Station, TX
I’m wondering if the oil pressure switch is bad. The system is not terribly sophisticated and I THINK I’ve ruled out fuses, relays, and a bad pump.
Mountain Pass
Joined: May 2014
Posts: 160
Likes: 54
I am not an expert on how the oil pressure switches work. My system has a driven diesel obs wiring harness. The oil pressure switch let’s the pump run for 20 seconds with the key on. If it’s not started in that 20 seconds it shuts the pump off. You could be on the right track with your thinking, I just have experience with how mine is set-up.
Laughing Gas
Joined: Jan 2016
Posts: 910
Likes: 96
From: Fl.
You would not be the first to have a problem with the oil pressure switch. I have never had one on my e fuel and i have read where others took it out of the system. By pass it and see what happens. I think you are on the right track also.
Fleet Owner
Joined: Aug 2004
Posts: 20,419
Likes: 197
From: AZ
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Cargo Master
Joined: Feb 2010
Posts: 2,526
Likes: 6
From: College Station, TX
I am not an expert on how the oil pressure switches work. My system has a driven diesel obs wiring harness. The oil pressure switch let’s the pump run for 20 seconds with the key on. If it’s not started in that 20 seconds it shuts the pump off. You could be on the right track with your thinking, I just have experience with how mine is set-up.
I'm also curious how the engine cranks and stays running at all without a functioning pump.
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Lead Driver
Joined: Sep 2002
Posts: 9,554
Likes: 2,035
From: North Texas
I THINK one of the guys here runs an inertia switch from a gasser. @nateairman maybe does As for me, I figure if I roll over in this truck I am going to die anyway so I do not care about such features...and oil pouring out and back will stall the engine due to no pressure to pop the injectors.
Good deal on the wiring, I had considered a crap ground may be your issue.
Why it runs with no pump, I have heard it is possible but not experienced. When my old Walbro died, that was it...dead. I guess maybe due to it seized and not lack of power. Also makes me want to get a 7.3 SD Boosch pump on there as it is Diesel rated. The Walbro is not.
Good deal on the wiring, I had considered a crap ground may be your issue.
Why it runs with no pump, I have heard it is possible but not experienced. When my old Walbro died, that was it...dead. I guess maybe due to it seized and not lack of power. Also makes me want to get a 7.3 SD Boosch pump on there as it is Diesel rated. The Walbro is not.
Cargo Master
Joined: Nov 2009
Posts: 2,559
Likes: 20
I THINK one of the guys here runs an inertia switch from a gasser. @nateairman maybe does As for me, I figure if I roll over in this truck I am going to die anyway so I do not care about such features...and oil pouring out and back will stall the engine due to no pressure to pop the injectors.
Good deal on the wiring, I had considered a crap ground may be your issue.
Why it runs with no pump, I have heard it is possible but not experienced. When my old Walbro died, that was it...dead. I guess maybe due to it seized and not lack of power. Also makes me want to get a 7.3 SD Boosch pump on there as it is Diesel rated. The Walbro is not.
Good deal on the wiring, I had considered a crap ground may be your issue.
Why it runs with no pump, I have heard it is possible but not experienced. When my old Walbro died, that was it...dead. I guess maybe due to it seized and not lack of power. Also makes me want to get a 7.3 SD Boosch pump on there as it is Diesel rated. The Walbro is not.
Fleet Owner
Joined: Aug 2004
Posts: 20,419
Likes: 197
From: AZ
My pump has died but I was able to drive it a short distance to find a place to pull over. The injectors themselves will suck fuel but its real hard on the injectors. In the thread about a stolen OBS a guy mentioned a toggle switch cutting off the pump isn't going to work because there is fuel in there and it will start.
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Cargo Master
Joined: Feb 2010
Posts: 2,526
Likes: 6
From: College Station, TX
Lots of great input. For now I’ll swap the oil pressure switch and see how that goes. So long as it’s the fix I’ll look for the next move to ideally eliminate it altogether. Will report back ASAP. Thank you all.
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