I have a 2003 5.9 cummins with a six speed transmission I just installed the quadzilla rail pressure gauge and went to test it out and dumped the clutch in 3rd around a corner and now the truck runs rough and the rail pressure gauge is not showing and pressure what could it be? Could it be the rail pressure gauge? I dont have any codes yet it jumps between 500-800 rpms now and runs really rough. Thanks

 

took the connection apart and disconnected the quadzilla rail pressure gauge and the truck dosnt seem to be getting any rail pressure the truck will only start with a small shot of starting fluid and when that burns off it dies again. The injector pump is getting 20 PSI of fuel casue I have a gauge on the inlet side of the injector pump.

 

For starters, DO NOT USE STARTING FLUID on a Dodge equipped with a Cummins!!! If the grid heaters cycle you could experience an explosive reaction.BOOM

 

I know about the heater grid but Its the only way the truck will fire right now and I am only useing a small squirt and it dies right after that, I just unplugged the FCA and it didnt help any either

 

Have you cycled the key to look for codes?

 

I got two codes P 0192 and P 0251

 

P 0192 is Fuel pressure sensor circuit, voltage too low and P 0251 is CP# pump regulator control which is probley from me unplugging the FCA and tring to start the truck

 

My truck did the same thing at a truck stop once, ended up being a loose passenger side battery cable.

 

I dont think thats going to be it casue the truck was running fine until I reved it up and dumped the clutch in 3rd

 

I would remove the gauge, hit one of the parts stores that will loan you a scanner and clear the codes. Then see if it will start.

 

I can clear my codes at home with my programmer I will try that and go from there, but I was thinking that if the quadzilla rail pressure gauge wasnt reading after the clutch dump but it was reading before then maybe the rail pressure gauge died.

 

Start with the simple stuff.

 

Ok I took of the chip and boost fooler and un installed the programmer and the only thing I have connected is the quadzilla rail pressure gauge and when I try to start the truck the gauge stays on 0 so I am guessing the rail pressure sensor is bad, where would I find one? autozone, kragens, napa, or car quest dosnt have it or carry it. Maybe a dodge or cummins dealer part only.

 

It is a dealer only part, and it is not cheap iirc. Try checking the battery connections, I had one loose a while back and it would not start because of that. I know it sounds odd but give it a shot.

 

Well it was the rail pressure sensor, but dodge wanted 600 for the bosch part so I went to the junk yard and paid 30 for it truck runs fine now. thanks for all the help