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Young1 · 02-23-2020

My experience is that the under plenum electrically activated vacuum valve gets old and leaks. Thus the pump does not cycle on and off normally. I go throughly through all connections and clamp, zip tie or glue all connections. Personally message me and I will forward you the part number. I have done this on 2 different cars. Last valve I ordered was 25 bucks on Amazon.

02-23-2020	#9
Young1 Join Date: Sep 2016 Location: Ocala, FL Posts: 897	Re: Zr1 secondary pump My experience is that the under plenum electrically activated vacuum valve gets old and leaks. Thus the pump does not cycle on and off normally. I go throughly through all connections and clamp, zip tie or glue all connections. Personally message me and I will forward you the part number. I have done this on 2 different cars. Last valve I ordered was 25 bucks on Amazon. __________________ Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much.