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78 3.0 OMC I/O idle rough, gas smell

78seasprite

New member
Ran hard/great for 2 hours, temp good at 160, then it started sputtering, then it got better for a bit and then it started up again. Died at lower RPM's. Oil is good, Head is new by dealer last year as is starter, linkage. Prop spins freely.

Gas smell seems strong unlike before.

2 weeks ago went through 3/4 tank in 90 minutes. Today with full tank Premium went for 2.5 hours and barely below full mark-though I did fill it full! I even had some gas seepage once lowered onto ball hitch. stopped after releasing pressure from gas cap to just do it again shortly after. Was 100 degrees out though. Didnt seem to do so during/after 30 minute drive to lake. Probably over filled it but strange didnt seep out until I lowered the bow(gas cap n all on back of boat).

Pulled plugs and the white part was deep brown and gray. metal part was also brown.
Noticed oil dipstick was up 1/2 inch and some oil splatter on starter wires a bit and fuel pump-wiped it all off, oil looked good still.

Water in fuel maybe, fuel pump going bad maybe.

Any ideas please,thanks in advance
 
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