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Engine Specific Info and Questions => IDI Engine => Topic started by: dieselgeer on October 03, 2008, 11:40:31 am

Title: Adjustments to a ve injection pump.
Post by: dieselgeer on October 03, 2008, 11:40:31 am

There are three adjustable screws on a Bosch VE pump. I know the low speed and the max speed that stop the throttle plate. What's the third one do?

Title: Adjustments to a ve injection pump.
Post by: zukgod1 on October 03, 2008, 12:06:49 pm

If your referring to the one with the 13mm lock nut on it and a slot for a flat blade screw driver in the end of it that's the MAX fuel screw.

Title: Adjustments to a ve injection pump.
Post by: dieselgeer on October 03, 2008, 12:29:47 pm

Can it be turned up to get more fuel at top end. My 91 jetta 1.6 NA seems a little fuel starved. My Mercedes 300D had an adjustment that one could achieve a little black smoke on heavy acceleration. Would adjustment this the same do you think?

Title: Adjustments to a ve injection pump.
Post by: cyrus #1 on October 03, 2008, 04:23:25 pm

The max fuel screw should give you more fuel (and smoke) through the existing powerband.  If you actually want to rev higher you will need to alter the governor.

Title: Adjustments to a ve injection pump.
Post by: dieselgeer on October 05, 2008, 04:09:59 am

Cranked the MAX FUEL screw in 1/4 turn before driving home from work and it seems better. I'm going to keep increasing 1/4 turns until I get a little black smoke.