1998 mercruiser 7.4l horizon

[jake88]

Replaced the fuel pressure regulator and all vacuum lines associated with this, Started engine and ran fine for about ten minutes and died. Still have 36psi of fuel pressure at the rail. Cranked and cranked still no start. Pulled fuel filter on and it was only about 3/4 full, dumped to see if there was any junk or water, nothing. Reinstalled filter and did the key on- key off to prime about ten times and filter is maybe a half full and rail pressure back up at 35 psi but no start. Pulled a couple plug wires to check for spark, have good spark. Need help! Any ideas, Please.

 

[scoflaw]

36 is low if you have a mefi 3, correct if it's mefi 1 or 2. Back story? Did you try advancing the throttle?

 

[jake88]

Its a MEFI1, 34-38 psi.