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clinebarger · 05-29-2015, 08:02 PM

It is a Vacuum Pump, All 6.0L Isuzu NPR had them. Remove it & buy a new belt. You will need a Vacuum "Push-in" fitting for the back of the intake if your running Vacuum assisted brakes.

The Vacuum Pump supplies Vacuum to the brake booster, If the engine dies or the Pump Fails, They also had a back-up Electric Vacuum Pump, Kind of a weird system that is super expensive when parts are needed, IIRC the Vacuum pump alone is over $300 & is only available from Isuzu.

05-29-2015, 08:02 PM	#5
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: What is this on my LQ4 It is a Vacuum Pump, All 6.0L Isuzu NPR had them. Remove it & buy a new belt. You will need a Vacuum "Push-in" fitting for the back of the intake if your running Vacuum assisted brakes. The Vacuum Pump supplies Vacuum to the brake booster, If the engine dies or the Pump Fails, They also had a back-up Electric Vacuum Pump, Kind of a weird system that is super expensive when parts are needed, IIRC the Vacuum pump alone is over $300 & is only available from Isuzu. Last edited by clinebarger; 05-29-2015 at 08:12 PM.