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    Mercury 1996 250 efi oil injection

    is the fitting that is threaded into the VST tank at the bottom suppose to be a check valve type. I was servicing my VST tanks on my 2 motors and noticed that one allows easy blow thru and the other requires a little pressure. The one that requires pressure also acts like a check valve and does...
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    1996 250 EFI runs rough

    twin engine deep vee.one engine running good other is not. All new fuel ,filters,plugs,fuel,motor sounds like it is running on 3 cylinders and excess fuel coming out of prop wash. put new plugs in ran a little better for a few minutes. All plugs are black and wet. I did the following: ran...
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    1989 mercury 175 hp carburated hard restart after fast run

    cold starts good. idle a bit rough but no hesitation and acceleration to full throttle good. coming off a midrange or faster run to an idle is good. Shut engine for a bit as skier gets in and out . Then go to start motor and it cranks fine BUT WONT START fuel ball hard.enrichener working but...
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    1986 merc 175 carburated

    Motor was running perfect, then idle was missing but when you hit the throttle it had full power no issues. Checked to see what cylinder was not hitting at low speed and # 4 was not making a difference but had strong spark constant. tied boat up tight to dock put in gear held plug wire off...
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    1986 Merc 175 hp low end miss

    Motor starts good, cylinders 1 and 3 strong spark but no fire at idle until rpm is up to 3300 or more under load or not. At higher rpm under load pulled plug wire and definitely is firing as it made motor slow down. The spark is constant strong all speeds,carbs rebuilt but were clean...
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    1996 300hp EFI fuel pressure high

    I have excessive fuel pressure on my port engine ( 57 psi ) the other is ( 38 psi ) which meets specs. A new regulator is $ 375.00. I have not removed it yet . Is it possible it is stuck and what to look for. Is this a commom issue. Fuel is new. The needle actually vibrates up and down a...
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    Merc 175 hp 1986 bleed hose location

    I have a manual for this motor ( Selog) and a real merc manual for my late model 3.0 s, This motor has been in storage a few years and I want to confirm from where does the line come that goes to the air box and also that this motor does not have the bottom crank to top crank hose set up...
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