Engine/Transmission (1998.5 - 2002) Impact of non-functioning FASS

[MKresge]

I installed a FASS on my 2002 3500 about 6 weeks ago and a new high pressure pump was installed by Dodge at the same time. Fuel pressure has been about 19-20 psi. About a week ago the ground wire from the FASS was inadvertantly removed so the FASS wasn't working for this past week of driving. I didn't pay much attention to the fuel pressure gauge, which was reading 0 psi, because I thought it was a bad wire connection on the gauge. Does anyone think this has hurt the new high pressure pump? I don't notice any significant performance change.

 

[OL RATLR]

I installed a FASS on my 2002 3500 about 6 weeks ago and a new high pressure pump was installed by Dodge at the same time. Fuel pressure has been about 19-20 psi. About a week ago the ground wire from the FASS was inadvertantly removed so the FASS wasn't working for this past week of driving. I didn't pay much attention to the fuel pressure gauge, which was reading 0 psi, because I thought it was a bad wire connection on the gauge. Does anyone think this has hurt the new high pressure pump? I don't notice any significant performance change.

If the pump they installed was still good you didn't hurt anything probably

but if you was running with a bad lift pump with 0 pressure 6 weeks yes.

 

[LowFly]

I installed a FASS on my 2002 3500 about 6 weeks ago and a new high pressure pump was installed by Dodge at the same time. Fuel pressure has been about 19-20 psi. About a week ago the ground wire from the FASS was inadvertantly removed so the FASS wasn't working for this past week of driving. I didn't pay much attention to the fuel pressure gauge, which was reading 0 psi, because I thought it was a bad wire connection on the gauge. Does anyone think this has hurt the new high pressure pump? I don't notice any significant performance change.

The FASS has a built in safty feature for stuff just like this. It has a bypass built in if the pump should ever stop with the truck running. This keeps the restriction down to the injection pump and will let you get home. All fuel will be still filtered.



If you didnt drive like a mad man that week, i think you will be ok. What gets me is that you were able to start your truck for a full week with out the FASS priming the VP off the bat. Now we do have somewhat of a redundant ground setup as well on our harness for the 98. 5-04 trucks. It pulles ground from the BATT and also from the ECM. This is weird that it was not running. the system should run with either ground connected. We just found that it was better to run a tap to the BATT. Brushes were a lot happier!

 

[MKresge]

Thanks for the info Diesel-Dan. I had absolutely no trouble starting the truck for that whole week. When I noticed the BATT ground disconnected, I listened for the sound of the FASS when starting again but I didn't hear it run. I reconnected the ground and started again (no sound of the FASS). I shut off and started a few more times and then heard the FASS.