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Thread: Fuel pump
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06-14-2019, 08:00 PM #1Junior Member
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Fuel pump
I have 94 mariner 150hp outboard that when I connect the battery the fuel turns on and does not turn off. What could cause a fuel pump to continuously run? Please help lol.
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06-14-2019, 08:15 PM #2Member
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A bad ecm or the ground leg is grounded
by a bare wire. Clay
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06-14-2019, 08:29 PM #3Junior Member
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Ok thank you. I will try that.
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06-14-2019, 08:37 PM #4Member
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Btw it would be a good idea to have battery disconnected
while looking for the issue.
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06-15-2019, 12:02 PM #5Junior Member
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Thank you. Look like ground is good. I am starting to think ecu. I'm gonna see if I can find a shop that will test it for me.
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06-15-2019, 12:34 PM #6Member
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On these outboards the ecm controls the fuel pump by
interupting the ground side of pump circuit. The positive
side is always hot. If you can’t get it repaired I have one
off a 1999 175 and a 1996 or so 200.
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06-15-2019, 03:41 PM #7Member
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I bought a cheap aftermarket replacement pump to replace the pump on my 92 xri 200 (bad idea). The pump looked the same, but when I installed it it was slightly longer than the original and the pump housing touched the block. When I attached the battery, it would run constantly. Obviously makes sense based on the explanation on how the ECM controls it per Tritontr19.
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06-15-2019, 04:28 PM #8Junior Member
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I see. Looks like I'm gonna have to get a ecu. Hmm did want to do that. Might just by pass it with a on off switch lol
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