Detuning 300tdi fuel pump - Defender Source
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  #1  
Old April 15th, 2014, 01:48 PM
Gazjoe
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Gary Mulligan
1998 110 Defender
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Detuning 300tdi fuel pump

Hi all, I have just bought a 110 with a 300tdi engine 1998, but it smokes black while on full throttle. I have been told that the fuel delivery screw on the rear of the pump has been tweaked but I am not sure by how much. Does anyone know how to reset it to a stock/standard position that I can then work from please?
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  #2  
Old April 15th, 2014, 01:53 PM
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Red90
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John B.
1991 Defender 90, 200TDI
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Just back it off a known amount and go for a drive until you are happy.
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Old April 15th, 2014, 02:19 PM
Gazjoe
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Gary Mulligan
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Cheers Red, how much should I back it off by each time, maybe 1/4 turn? I guess I stop when the smoke stops but what if I back it out too far, what would happen then?
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Old April 15th, 2014, 02:23 PM
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Red90
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John B.
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Try 1/2 a turn at a time. Just write it down and keep track of where you are. You can always put it back at any time. The power will drop as you do this, so you find a place where you are happy. As much fuel as possible without excess smoke.
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Old April 15th, 2014, 02:25 PM
Gazjoe
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Gary Mulligan
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Thank you very much for your quick advise, a great start to a new forum for me!
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Old April 15th, 2014, 09:00 PM
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Viton
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In my experience with Bosch FIP's, (since 1981) 1/2 of a turn is a large adjustment. Turning down means going counter clockwise. I'd start with 1/4 turn, and then 1/8th after that. Be sure to hold the screw with a screw driver while you tighten the locking nut with a wrench as the screw tends to turn while tightening the nut.
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Old April 16th, 2014, 04:19 AM
Gazjoe
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Gary Mulligan
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Thank you Dennis.
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