Join Date: Jan 2017
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
If 4WD - system: QD-II
Current Mileage: 96k
5.7 fuel pressure test?
Does anyone here have any ideas on how to check the fuel pressure on a 5.7 ('06)? I can't find a port anywhere, and the manual makes no mention of it but does list Mopar 6631 and/or 6539 as special tools which look to me like they add a temporary port in line so you can test.
A stuck open fuel pump check valve is the only thing I can think of that would explain my symptoms but it sure would be nice to do what should be a quick and cheap fuel pressure test before dropping $240 on a fuel pump that may not be needed.
FWIW, symptoms are:
Engines cranks good and strong but won't start
On 2nd try it sputters a bit and sometimes starts, sometimes doesn't.
3rd try fires up every time like normal.
If I don't crank but just turn the key on for a few seconds, then off, on, off, and crank then it always fires right up also (i.e. what I think I am doing is priming the pump to build up pressure).
No codes have been thrown, and this happens whether it has been of for a minute for a day, hot or cold, etc.
In the meantime I dumped a bottle of fuel system cleaner in the tank hoping for some magic to happen.