92 Mercruiser 5.0 Stalls

[udm328is]

Hi all,
I am having an issue with stalling and would appreciate some feedback. I replaced the fuel/water separator and I still seem to have the same issue. I start the motor and it runs for about 30 seconds to a minute at idle speed and then cuts out, if I rev the motor it cuts out even soon. Any and all advice and or thoughts is appreciated as always.

Thanks,
Eric

 

[achris]

Re: 92 Mercruiser 5.0 Stalls

Eric,

Electric fuel pump or mechanical. If it's electric it sounds a lot like the oil pressure switch that feeds power to the fuel pump... (or associated wiring)...

Chris.....

Can you give us a serial number?

 

[udm328is]

Re: 92 Mercruiser 5.0 Stalls

Thanks Chris,
SN is 0D712714, I just bouth this boat a couple weeks ago and started with nothing but it turning over but not starting. Now when it starts it sounds awsome until it cuts out. After my first post I went out and messed with it some more. It would idle pretty well until i throttled up then that would kill it. From there I could throttle up a bit and the engine would pulse with out touching the throttle. I reved it up a few times, something seems to have blown out a bit from the exhaust and it seems to be better now, will look at it more in the daylight. My other issue if you have any ideas is the power steering. The resevoir was empty, I filled it, steering is damn near impossible, I don't see any leaks anywear however. OK, thanks again...

Eric

 

[achris]

Re: 92 Mercruiser 5.0 Stalls

Whit the steering, start a new thread. It's a different issue and other people might help that would not have read it under the current title... The running issue needs some more detailed diagnosis... You need to determine where it's stopping due to fuel or spark... If it's fuel it could be a weak spring in the fuel pump... It would operate properly at low engine speeds but 'bounce' when the engine speed is increased... If it's spark, you'll need to run through some diagnostics on that... Have a timing light hooked up and as it stalls take a look at the flashing... Does it lose spark or is the ignition system still firing?

Chris...