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09-06-2015, 03:44 PM #15000 RPM
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Lost fuel pressure ,fuel coming out of number 6 cylinder
1999 Mercury 300 pro max, was running down river fine, then slowed down and cut off. Pumped primer bulb up and got back end. Pulled spark plugs and checked fuel pressure -none. Pumped primer bulb tight , turn key on no fuel pressure, hear pump running ,crank motor over without spark plugs, fuel is pumping out of number 6 cylinder
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09-06-2015, 05:00 PM #2
may have spit the tip off that injector
"One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors". Plato .
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09-06-2015, 05:02 PM #35000 RPM
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What would cause #5and #6 injector to spray fuel wide open. Motor isn't even running , key in the on position ,injectors steadily spraying
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09-06-2015, 05:04 PM #45000 RPM
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Just had injectors clean 2months ago by brucati
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09-06-2015, 05:42 PM #5Screaming And Flying!
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pintel stuck open
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09-06-2015, 06:16 PM #6
Unplug them and see if they still keep spraying
"One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors". Plato .
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09-06-2015, 09:32 PM #7Member
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Had a 250 3l efi years back with the same problem. The ground for 5 and 6 in the fuel ecu stuck closed. Replaced the fuel ecu all good.
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09-07-2015, 05:27 AM #8
you have the promax with the laser style intake?
O ring leakage? ( fuel rail)
maybe got damaged when assembling
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09-07-2015, 07:04 AM #95000 RPM
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Ohm your injector harness. If you disconnected the plug for the injectors does it still lose fuel pressure . If they are good pull the front of the intake off. Either the orings for the injectorsare bad or a pintle is stuck or orings for the fuel lines are bad.
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09-07-2015, 01:24 PM #105000 RPM
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I discounted the fuel injecter harness and it stops spraying. I'll check the harness but I got a feeling it's the fuel ecu.
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09-07-2015, 04:15 PM #11Checkmate 2002 Convincor 270 496 MAG-HO
2003 Cougar 22MTR w/300xs SOLD
90 21Skater w/300xs - sold
98 STV Euroski w/280 - sold
2006 Trailblazer SS 6.0l 395hp
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09-07-2015, 06:24 PM #12
I had same problem with a 300 pm. It was the fuel computer...
Cawley
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