Fuel pump problem

drappuhn

Cadet
Joined
Oct 5, 2022
Messages
6
Hello all, Trophy 2359 2004 with 5.0mpi and Bravo 3. Serial 0w029519. Replaced both the inline fuel filter and spin on filter that is right after the low pressure fuel pump. Had a tough time getting it to prime but finally did and it ran good on muffs.. Took it out to lake 3 weeks after running it on muffs and it would not start. It will start on ether so have spark I assume. Checked pressure at fuel rail after turning key to on position and it is 0. I can hear the low pressure pump priming.. can not tell with the high pressure as it is deep under engine on port side in plastic box it seems. Is there a way to tell if the low pressure pump is actually working? Much easier to get at then the high pressure so hoping that is it possibly. Would replace both but man they are expensive.
 

dingbat

Supreme Mariner
Joined
Nov 20, 2001
Messages
16,066
Is there a way to tell if the low pressure pump is actually working?
Remove the fuel line from the LP pump to the HP pump and try starting it.

If LP pump is pumping fuel, it's working
 

drappuhn

Cadet
Joined
Oct 5, 2022
Messages
6
Removed the fuel line from the LP pump and we had fuel squirt out when priming... so I guess onto the high pressure pump.. Shame because it is sure hard to get to.
 
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