Author Topic: Adjustments to a ve injection pump. (Read 1895 times)

dieselgeer · « **on:** October 03, 2008, 02:40:31 pm »

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?

zukgod1 · « **Reply #1 on:** October 03, 2008, 03:06:49 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.

dieselgeer · « **Reply #2 on:** October 03, 2008, 03:29:47 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?

cyrus #1 · « **Reply #3 on:** October 03, 2008, 07:23:25 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.

dieselgeer · « **Reply #4 on:** October 05, 2008, 07:09:59 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.