No fuel pressure.....
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Joined: Feb 2013
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No fuel pressure.....
I've got an 89 bronco that had a 302 and an AOD tranny in it. I swapped them out for the 4.9 and an M5R2 stick. I also dropped the EFI and went to carbs. The issue that I'm having is my fuel pump. I have power everywhere else, but I can't get any pressure. It worked great before, and it was actually replaced recently, so I'm confident that it is good. I replaced the relay, and still nothing. When the key is turned on, I get a second or two of fuel in the lines, but it stops. Any ideas?
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Yeah, I figured out why the pressure is not there. Talked to my uncle who is a mechanic. The computer has to tell the pump that the engine is turning, and then the pump turns on. My only solution that I can think of is to just bypass that and force the pump to run as long as the key is on. It's harder on the pump, but is the only solution I can think of for the moment.
Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
You need to run the pump THROUGH the inertia switch no matter what you do. The inertia switch kills power to the pump in the event of a collision. If the pump circuit is not protected in this manner and the truck is involved in a collision, the fuel pump will continue to pump fuel after the engine has stalled or a fuel line has been severed. Neither condition is a good idea in the event of a collision. Raw fuel + dead engine + heat = BOOM!
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