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Old 05-03-2011, 02:40 PM
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Electric fuel pump issues, flow

Hi guys,
Need your help...I have a Mallory procomp 110 on my 67 Camaro that is running in reverse flow. The inlet and outlet are backwards. The sticker that says "OUT ->" is pointing to the incoming fuel line which doesn't seem right?

I noticed if I reverse the wiring to the pump it will run in reverse...is that bad for it? I would assume the inlet with the built in filter should be where the fuel goes in?

Any help would be much appreciated.

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Old 05-03-2011, 06:30 PM
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It is a permanent magnet motor, it will run backwards if you have it hooked up backward( or someone does) sounds like it. I have seen black wire used for positive and red for ground. It is so wrong to do that but some people do.
You need to verify the power and ground is on the correct lead (polarity)
( wich I doubt it is if its running backwards) and hook it up correctly so you can correct the plumbing ...inlet outlet...you know.
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Old 05-04-2011, 12:11 PM
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reverse flow pump

Thank you for the response. It goes against all I have learned to switch the wires around but I need it to flow properly. I did have the local auto electric shop work on the motor when it broke (less than 1 hour on it) and maybe they switched something?

Anyway, it runs as it should now.
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