Front fuel pump issues
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3rd Gear
Joined: May 2026
Posts: 3
Likes: 0
Front fuel pump issues
Hello everyone,
I recently swapped the front fuel pump in my 90 f150 out for a new unit due to the gauge not working. I know it was probably a bad idea to swap the whole unit but I couldn't find a replacement sending unit for a reasonable price so here we are. The truck sputters and runs like crap on the front tank but runs great as soon as it is swapped to the rear (which still has the factory pump). After driving for a while I can switch the tank back to the front and have it run pretty decent under load but as soon as I turn the truck off and back on it runs like crap again. I'm planning on buying a fuel pressure tester to get readings from both tanks, but I would like to hear any suggestions you guys might have.
Thanks!
I recently swapped the front fuel pump in my 90 f150 out for a new unit due to the gauge not working. I know it was probably a bad idea to swap the whole unit but I couldn't find a replacement sending unit for a reasonable price so here we are. The truck sputters and runs like crap on the front tank but runs great as soon as it is swapped to the rear (which still has the factory pump). After driving for a while I can switch the tank back to the front and have it run pretty decent under load but as soon as I turn the truck off and back on it runs like crap again. I'm planning on buying a fuel pressure tester to get readings from both tanks, but I would like to hear any suggestions you guys might have.
Thanks!
Fleet Mechanic
Joined: Oct 2025
Posts: 1,899
Likes: 418
Hello everyone,
I recently swapped the front fuel pump in my 90 f150 out for a new unit due to the gauge not working. I know it was probably a bad idea to swap the whole unit but I couldn't find a replacement sending unit for a reasonable price so here we are. The truck sputters and runs like crap on the front tank but runs great as soon as it is swapped to the rear (which still has the factory pump). After driving for a while I can switch the tank back to the front and have it run pretty decent under load but as soon as I turn the truck off and back on it runs like crap again. I'm planning on buying a fuel pressure tester to get readings from both tanks, but I would like to hear any suggestions you guys might have.
Thanks!
I recently swapped the front fuel pump in my 90 f150 out for a new unit due to the gauge not working. I know it was probably a bad idea to swap the whole unit but I couldn't find a replacement sending unit for a reasonable price so here we are. The truck sputters and runs like crap on the front tank but runs great as soon as it is swapped to the rear (which still has the factory pump). After driving for a while I can switch the tank back to the front and have it run pretty decent under load but as soon as I turn the truck off and back on it runs like crap again. I'm planning on buying a fuel pressure tester to get readings from both tanks, but I would like to hear any suggestions you guys might have.
Thanks!
Thread Starter
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3rd Gear
Joined: May 2026
Posts: 3
Likes: 0
This is actually a warrantied pump, probably should have mentioned that in the og post. The pump I warrantied had an issue with the check valve built into the pump and I could blow through the inlet. new pump doesn't seem to have this issue but still runs like crap.
Hotshot
Joined: Jul 2020
Posts: 10,572
Likes: 2,678
From: Near Salt Lake City
I believe Bosch made those early pumps for ford
Look up one for a 1990 Ford Ranger for instance, and you will see a ton of pumps, most not worth a row of rat sh it
Look at Ebay item # 361092821497
It is a new Motorcraft pump that should be able to be put into your existing 1990 sender assembly
That is what I do these days, find a Ford pump and put it into the module assembly I need to fix
Look up one for a 1990 Ford Ranger for instance, and you will see a ton of pumps, most not worth a row of rat sh it
Look at Ebay item # 361092821497
It is a new Motorcraft pump that should be able to be put into your existing 1990 sender assembly
That is what I do these days, find a Ford pump and put it into the module assembly I need to fix
Last edited by manicmechanic007; Jun 9, 2026 at 06:54 AM.
Cargo Master
Joined: Mar 2007
Posts: 2,862
Likes: 1,043
What brand is this pump? If it is cheaper than a good sensor, that is a problem right there.
Last edited by 1Butcher; Jun 9, 2026 at 09:31 AM.
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