Adjustment on injector pump? - Ford Powerstroke Diesel Forum
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Old 02-25-2010, 07:41 PM
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Adjustment on injector pump?

ok I have been reading up on turning the fuel up on my idi. I understand all that but in one thread i read some guy was talking about a second adjustment screw ( the one not behind the triangle plate) that will produce alot of smoke if adjusted. my question is where is this screw and what does it do exactly? Can it hurt anything if messed with? Thanks.
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Old 03-02-2010, 06:39 PM
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Its located in the center where all the the center fuel line goes into the IP, surrounded by the 8 injector return lines.

I would recomend NOT to adjust this one. Its an allen screw, and it raises or lowers the inlet fuel pressure, which will mess with your timing. To much timing will burn glow plugs.
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Old 03-02-2010, 10:12 PM
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thanks for the tip, thats good info to have.
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Old 03-15-2010, 12:09 PM
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You might want to search some of the other forums that have a larger IDI following tio get more infoamtion about this.

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Old 03-15-2010, 10:35 PM
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Ok after reviewing this I need to mention that some pumps have another screw to mess with. 92.5+pumps have a screw that will adjust low rpm fueling. If you back it out it will fuel more on the bottom end, if you screw it in it will decrease fueling on the bottom end. I hear that it only effects rpm's below 1100rpm's. Some say it helps with turbo's to lessen turbo lag at low rpm's, others say it hurts.

Its at a 45* angle on the back of the pump above the eight injector lines. Maybe thats the one your talking about?
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