CTD01

I bought the Walbro 392 Fuel system from GDP. Installed it and pressure was perfect 18-20psi idle and no lower than 15. All of a sudden it would drop like a rock to 0. So I called Rich he told me to check my connections they were good. I called again he told me to change my bypass valve on the VP did that good for like a month. Now when the truck is cold the pressure is like 18-20 idle and drops at the slightest throttle. Now today it was like 32 degrees out started the truck no pressure. Bumped the starter so the pump would run a few times. it would go to 20 until it shut off then when I started it it wouldbe at zero finnaly started and went to like 10 and wobbled then was good all the way to work. What gives?

PaulDaisy

Maybe the electric sender for the Attitude?..
-P

ct2500

No Its not hooked up to that it has its own gauge now. Rich is sending me a new pump.

badme

I think you useing the same setup as I am. You need to check the bypass valve that came with the pump. Mine would do the same thing, I had to take mine apart and sand the needle seat inside with very fine sand paper (800-1000 grit)
Then I cleaned everything real good with carb cleaner and lubed it up with some crc 556 put it back together and it has been fine since. The needle in the bypass valve that came with the pump would hang up and all the fuel would go back to the fuel tank and I would have 0 preasure.

sluggo42

Put a needle valve in front of your edge sensor, it becomes very stable and nice!