i just bought a fass 95/150 series i installed it today when i turn on the ign the pump turns on then off ,the relay is doing what its told to do what input should i use to solve this problem ,also it seems i have a replacement my fuel pump is in the tank fass says i need to buy the drop tube from them but i was wondering if i could make my own have a nice day also i am showing zero lbs presure

 

The pump turning on and then off is competely normal. That's the same thing the stock pump does, you just don't hear it. Mine sounds like a small lawnmower when it cycles.

Try this, turn the key on and wait for the FASS to stop spinning. Then bump the starter, but DO NOT actually start the truck. The pump should cycle for approx 20 seconds, then turn off. It's completely normal.

When are you looking for fuel pressure? Is it when the truck and pump is running or just when you turn the key on.

You won't see any fuel pressure if the pump is not on. As soon as the pump cycles off, it bleeds off the pressure in the line. Completely normal.

Also, where are you trying to get the fuel pressure reading from and what setup are you using to try and get it?

There is a fuel pressure port located on the side of the FASS. It's a 1/8 NPT fitting on the side that faces away from the frame. It comes from the factory with a 1/8 NPT pipe plug in it. This location works good if you are using an electric FP guage.

You can also get it from the test port on the VP44, which is prefered for the VP44 powered trucks. This location is good if you are using a mechanical gauge with a snubber.

Again, neither of these locations will show any pressure if the pump is not running.

 

thanks for the reply i have an edge juice with attidude the sending unit for the presure is coming off the vp44 when i turn the ign on the pump comes on for .25 to .50 of a second now my lift pump is in the tank which iam going to change the pump should stay on longer am i wrong

 

Sometimes they do, sometimes they don't. If mine was just started and shut off, it won't cycle the pump.

Normally, it only spins for a short burst, maybe a half second. If you bump the starter, but don't start the engine, you'll hear the pump cycle for approx 20 seconds.

Is your FASS installed right now or are you still running on the stock pump?

 

fass is installed iam not driveing it of corse it sounds like the control voltage is not staying on like it should,the other lift pump may have been fine and the control voltage been the issue the whole time