Mercury, 90 hp, four stroke, EFI

by Dave C
(Indiana)

Engine starts on first crank. Runs fine for a period of time (10 to 30 minutes). Then runs rough and stalls. May or may not restart. If it restarts, it runs for a short period of time then stalls. Code on VesselView is 3075-28. Has Fuel Supply Module, and have changed both pumps, and float. Afterwards the same issue. Fuel pressure is at 42 psi when running good, then drops to 10 as it shudders and stalls. Any ideas?

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Aug 23, 2021
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by: Dave C

Yes, changed both fuel filters, ran from a remote fuel source to buy pass fuel tank.
Aug 22, 2021
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by: John

Assume you have checked the fuel filter, assume its fresh fuel, have you checked the fuel line back to tank connections and degradation, possible sucking some air in.

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