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  #1  
Old 06-11-2015, 08:44 PM
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How to check fuel pressure

Hi does anyone know how to check fuel pressure on an 05 grand Cherokee 5.7 Hemi. Trying to check if my fuel pump is still good. Truck is having issues starting.

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Old 06-12-2015, 09:56 AM
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Re: How to check fuel pressure

Hard starting can be a starter, battery, etc. Not necessarily a fuel pump. As for testing the pressure, I can't recall at the moment. I forget if you need to disconnect and injector or if the 5.7 has a test port.
I have an autoenginuity scanner and in Chicago, if you want to meet up and I can see if fuel pressure is available on it.
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Old 06-12-2015, 11:11 AM
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Re: How to check fuel pressure

What are the symptoms?
There is a schrader valve on the right front side of the fuel rail (as seen from drivers position), where a mechanical fuel pressure indicator can be installed. But when fuel pressure is the problem, you most probably encounter low power during acceleration and low mpg.
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Old 06-12-2015, 11:26 AM
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Re: How to check fuel pressure

The truck cranks but doesn't start. The etc light comes on also the esp light. I changed the throttle body last year was having the same issue. Just started up again. Asked a couple of mechanic buddies and they say to check the fuel pressure maybe the filter or pump don't work
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Old 06-12-2015, 11:38 AM
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Re: How to check fuel pressure

So it doesn´t start at all now? Do you hear the fuel pump for some 3 seconds when switching ignition to run? You can do a quick check for fuel, by pressing the schrader valve on the fuel rail. If fuel under reasonable pressure comes out, then the pump is not the problem. Keep a rag at the valve to catch any spills.
Did you check if there is any fault code set in the PCM?
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Old 06-12-2015, 12:00 PM
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Re: How to check fuel pressure

Yes does not start. Don't hear any thing from inside the truck. Tried to check via gas cap can't hear any noise
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Old 06-12-2015, 02:19 PM
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Re: How to check fuel pressure

It gives a failure of the secundary circuits of the coils, but i wonder if the primary circuit is monitored. I would check the fuses #6 and #16 in the PDC (feeding the ignition coils).
Also check fuse 24 on the junction block (feeding fuel pump and PCM).Regarding the fuel pump, the noise level is quite low and without engine running, it will only run for 3 seconds and be shut of by the PCM.
You can also swap the auto shutdown relay in the PDC with a similar relay in there, just for trouble shooting purposes.
The pages for faults 4 and 6 are not attached, but are probably for the coils D and F?
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Old 06-12-2015, 02:26 PM
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Re: How to check fuel pressure

Ok thanks I will try doing that today. Also saw something on YouTube on how to jump the relay for the fuel pump to see if it turns on
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