Bad fuel pump but I have 2?
I believe I have narrowed my lean issue to the fuel pump. But I have 2. One factory and one that came with the Vortech Supercharger. So do I replace one or both. If I replace one how do I figure out which one? I have a 01 F-150 HD. I just got it and I don’t know the history.
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Are you sure the fuel filter isn't plugged?
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Originally Posted by glc
(Post 5264335)
Are you sure the fuel filter isn't plugged?
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Not sure of your setup, but you may want to verify how to auxiliary fuel pump was wired up. Case in point, I have two Walbro 450lph pumps with one running all the time. The second pump only turns on when I reach a couple psi. I would check for a fuse to the second pump.. You need to determine how your pumps are wired, fused and possibly relayed, especially that second pump. Could be something as simple as a fuse to the second pump. If it's only lean under boost, start with that second pump.
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Originally Posted by UGL
(Post 5264403)
Not sure of your setup, but you may want to verify how to auxiliary fuel pump was wired up. Case in point, I have two Walbro 450lph pumps with one running all the time. The second pump only turns on when I reach a couple psi. I would check for a fuse to the second pump.. You need to determine how your pumps are wired, fused and possibly relayed, especially that second pump. Could be something as simple as a fuse to the second pump. If it's only lean under boost, start with that second pump.
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