85lebaront2 Posted November 7, 2021 Share Posted November 7, 2021 Yipes! The pump works, but is pulling way too much current? That sounds like a serious problem. Have you checked to make sure that no one has bypassed the resistance in the pump circuit? I don't think that, by itself, would account for the hot wire. But it wouldn't help. (Sure seems strange that the Bronco has the resistor but the F-Series doesn't. Wonder why?) The original pumps Ford used for the high pressure 1985-89 are Bosch ones, probably the same ones Mercedes used on their EFI vehicles in the 70s. My son had a 1986 F150 302 EFI truck, it had an aftermarket high pressure pump that worked but sounded like it was going to pieces. He scored a used one from a neighbor's totaled 1986 F150. When he sold the truck it was still going. I would bite the bullet and try to find a Bosch pump. Link to comment Share on other sites More sharing options...
old55pete Posted November 7, 2021 Author Share Posted November 7, 2021 The original pumps Ford used for the high pressure 1985-89 are Bosch ones, probably the same ones Mercedes used on their EFI vehicles in the 70s. My son had a 1986 F150 302 EFI truck, it had an aftermarket high pressure pump that worked but sounded like it was going to pieces. He scored a used one from a neighbor's totaled 1986 F150. When he sold the truck it was still going. I would bite the bullet and try to find a Bosch pump. as the orignal pump was a Bosh and NAPA offered a Bosh, that was what I replaced it with. The one I am putting on today is a Bosh. After I got it out, I shook it and it sounded like a trash can full of rocks. I hooked it up streight to the battrie and it made a loud hum and if I hit it with plyers it would come on for a second or so, it got so hot that I couldent hold onto it. All of the gas that drained out of it is clear. Link to comment Share on other sites More sharing options...
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