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Old 26-06-2009, 05:21   #16
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PS the good news is your motor is probably real clean on the inside!! Let us know if that was the problem.

Good Luck,
Steve
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Old 26-06-2009, 05:21   #17
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Hi,

There are not many parts in the fuel system and these are the last in the chain. I was thinking that the unused fuel is not getting back to the tank.

How about the fact that the fuel injectors must be within 3% of each other. If over 3% the engine output will drop and/or one cyliner will overheat. There is an injector volume adjustment plate on the side of the pump body.

Or one of your injection nozzels is sticking/ not fully closing.
If the fuel does not get back to te tank . How would it get to the sump?
Is there a connection there that I have missed?
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Old 26-06-2009, 05:23   #18
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The amount of fuel getting into the sump sounds way to much for overfueling and passing the rings. As well the engine would be running very badly and black smoking real bad. Not familiar with fuel system but a lift pump diaghram if fitted sounds much more likely as Steve suggested. Even blocked return lines (injector) etc would still not account for that amount of fuel.
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Old 26-06-2009, 10:36   #19
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Two ways fuel gets into the oil sump. A cracked diaphragm on the lift pump and worn/damaged seals in the high pressure pump (which has engine oil running through it for lubrication). The second is more common, but the first is cheapest to fix.
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Old 26-06-2009, 10:54   #20
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fuel can get into the sump with a bad diapragm in the mechanical fuel pump right?
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Old 26-06-2009, 10:55   #21
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Yup.
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Old 26-06-2009, 19:48   #22
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Usually the culprit is the fuel lift pump.

Second, if an injector tip is damaged it will squirt fuel into the cylinder, it can make it past the rings or blow past the valve seals.

Injector pump seals gone bad.....must be done in a shop.

#1 is most like the one
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Old 26-06-2009, 21:14   #23
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Usually the culprit is the fuel lift pump.

Second, if an injector tip is damaged it will squirt fuel into the cylinder, it can make it past the rings or blow past the valve seals.

Injector pump seals gone bad.....must be done in a shop.

#1 is most like the one
If the injector is damaged the engine would misfire and that has not been mentioned that I can remember?
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Old 11-07-2009, 15:28   #24
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Unfortunately the lifter pump is fine but the high pressure pump is not (expensive), well , well any ways the problem will be solved (will get the pump back from the shop on tuesday) cross my fingers ......
can finally go on holiday! (I hope).....
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Old 11-07-2009, 16:29   #25
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The seal on the bottom of the injector pump was leaking on mine, pumping fuel into the crank case. Removed the pump, sent it off to be rebuilt and that took care of it.

The repair shop told me that the seals had dried up from using to much fuel additive. I had just bought the boat so I did not know. I never use the stuff.
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Old 11-07-2009, 16:42   #26
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The seal on the bottom of the injector pump was leaking on mine, pumping fuel into the crank case. Removed the pump, sent it off to be rebuilt and that took care of it.

The repair shop told me that the seals had dried up from using to much fuel additive. I had just bought the boat so I did not know. I never use the stuff.
That was it . I do not know about the additives but it definetly pumped the fuel into the crank case.
I will ask the shop guy about the additives.
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Old 11-07-2009, 16:45   #27
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If the injector is damaged the engine would misfire and that has not been mentioned that I can remember?
i guessed I missed that crucial info in the thread. Yes it did only fire on two out of three cylinders.....
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