1996 250 EFI runs rough

paulsboat

Cadet
Joined
Jun 7, 2011
Messages
13
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 engine to get warmed up, check compression was good,plugs all sparking the same and jumping a good 3/8. went to each cylinder while on high idle and they all make a difference.Ran sea foam in tank,cleaned vapor tank
fuel pressure is a constant 37 psi. I had a 200 black max that was pumping fuel into block from a defective fuel pump. Could that happen on this engine.
 
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