Excessive fuel pressure

[Pares Motorsports]

Engine is a 1990 mercruiser 5.7 260 with a rochester 4bbl. Long story short I thought the needle and seat was bad as the carb kept flooding out with fuel, after rebuilding the carb the problem persisted. Today I spliced a tee into the feed line from the fuel pump to the carb and measured the fuel pressure. I am getting 13.5 psi at idle and a little over 14 at 1800 rpm. I figure the excessive fuel pressure is pushing the needle open and causing my flooding condition. What would cause this excessive fuel pressure from an oem mercruiser fuel pump? Aside from adding a regulator, how would I bring it back within spec?

 

[Bt Doctur]

Re: Excessive fuel pressure

replace the pump. you only need 4-6 lbs of pressure

 

[Prowler 5.1]

Re: Excessive fuel pressure

replace the pump. you only need 4-6 lbs of pressure

[quote = Prowler 5.1 ] had same trouble years back ! rebuilt carb ,did'nt help ! turned out it was small flake of varnish from fuel sitting over pressure releif valve inside fuel pump . removed that and no troubles for 20 years now! REMEMBER to use a fuel stabilizer every year. Hope I helped