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Anyone have an opinion on the wiring pictures, not working correctly. 95 Ford F250 5.8L dual tanks. Thank you . Front tank Rear tank Only wiring diagram I found for aftermarket FDM
According to that chart, I don’t think you have the wires correctly matched up for the rear tank. What problem are you having that you replaced both pumps? What brand has you splicing the wiring? The Spectra pumps I used on my ‘89 plugged right in.
Seems most aftermarket units have you swap the harness plug, no clue why. Bought one for my '92's side tank and saw same issue.
Two are for pump, two are for sender. Not really much to it aside from the nuisance factor. If in doubt, even a cheapass DVOM from Harborfreight will show you power to the pump and its ground.
Black on US stuff is almost always ground. Brown on Euro cars is ground (think Earth aka dirt color). Easy to find out with a basic continuity test to battery negative. Positive switch for pump, just use a test light once ground sorted. No clue what would happen if sender wires reversed, maybe it will read backward...so wire one way with float zip tied up fully, key on. If registers full, remove tie, recheck gauge. Obviously faster with help. Also, the larger wires should be for power to the pump to narrow down faster.
Let us know what you find out as this pertains to me and will save me time.
According to that chart, I don’t think you have the wires correctly matched up for the rear tank. What problem are you having that you replaced both pumps? What brand has you splicing the wiring? The Spectra pumps I used on my ‘89 plugged right in.
You were right 2 of the wires were not correct. But even after fixing the wiring the rear tank still overfilled and pumped gas into front tank. So I broke down and brought it to a shop on Tuesday. He said everything I did was correct and the only solution was a bad pump. It did cross my mind I bought a new pump in August of this year. So I went back to AutoZone because it was lifetime warranty got a new pump. It's only been two days but so far so good. Both pumps are acting correctly ,but I am waiting to fill them up again before I claim success and put the bed back on. Thank you for all your responses.
