FASS pump question?

[CStockton]

My pump runs when the key is in the on position (engine not started) and in the accessory position.

Is this correct?

 

[MountainMan1]

It should turn off after a few seconds. My Fass it hooked to the wire from the OEM pump. It is cut so no wiring to the OEM pump. You may start to get codes if that wire is not hooked to a working pump. I think it is orange with a white tracer. It is on my 05. The 05 may be a bit different hook up then some others.

 

[LowFly]

My pump runs when the key is in the on position (engine not started) and in the accessory position.



Is this correct?

It all depends on how the pump is wired. If you trigger off the stock ECM wire... . your pump will act like CStockton described. If you have the pump that tapped the fuse box, it will run like you described.

 

[CStockton]

Hmm... the instructions that came with my pump said to connect to the positive side of fuse 39 in the underhood fuse box.

Current instructions on the FASS site say to connect to the positive side of the battery with a relay.

I've been considering getting the Painless underhood fuse block kit so I can clean up some of the wires connected to the battery.

I'd really like to know how to connect the FASS so it only runs with the engine on.

 

[daytripper63]

CStockton since you added the FASS set up to your truck with the TST PMCR have you tried using your A/C for any time and did it cool ok?

I dont know what the deal is but I recently added the FASS and my A/c stopped working properly, I spoke to Mark at TST yesterday and he was familiar with the problem and had me relocate the ground wire from the battery to a ground under the dash and that took care of issue. Sounds strange but apparently going from a Direct ground to a secondary ground did it.

 

[CStockton]

CStockton since you added the FASS set up to your truck with the TST PMCR have you tried using your A/C for any time and did it cool ok?
I dont know what the deal is but I recently added the FASS and my A/c stopped working properly, I spoke to Mark at TST yesterday and he was familiar with the problem and had me relocate the ground wire from the battery to a ground under the dash and that took care of issue. Sounds strange but apparently going from a Direct ground to a secondary ground did it.

Thankfully I've not had that problem.

 

[LowFly]

We have a new updated harness for the 05+ Trucks (WH-1004) that Plugs back at the tank and lets the ECM control pump function.



OR you could get a relay and use the hot wire back at the tank (Pin #4) to trigger the relay. This would do the same thing more or less.

 

[CStockton]

OR you could get a relay and use the hot wire back at the tank (Pin #4) to trigger the relay. This would do the same thing more or less.

What type of relay would I need?

 

[LowFly]

What type of relay would I need?

Any standard 30 Amp Bosch or equiv.



Here is a schematic of our new WH-1004 harness to give you an idea on how we got it working:

 

[CStockton]

Good deal.

Thanks.