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Bluegorilla, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 29523
Experience:  14 years GM experience including GM training on the Duramax engine .
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I have a 09 c5500 6.6. When I unplug the frpr It will start

Customer Question

I have a 09 c5500 6.6. When I unplug the frpr It will start and idle fine but if it's plugged in it just starts and dies and if I pump the primer ball constantly it'll stay running but won't throttle up.
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Pete replied 1 year ago.

My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.

My info is somewhat limited on your model here but I had seen no one else has responded and would like to see if I can help here.If at any time you feel that I cannot help with this please let me know.

This can be due to a fault with one or more fuel injectors leaking down into the engine or allowing to much fuel into the engine when cranked over or allowing to much fuel through its return port causing this here.I have also seen the fuel rail pressure sensor itself send a false fuel rail sensor reading needing replaced.These need to be checked/tested further to locate which is the cause here and from there repaired to correct this fault.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.Thanks Pete.

Customer: replied 1 year ago.
I have done a balance rate on the Inj they tasted good the frpr is good also I did a bottle test on it but the voltage going in and out of the frpr wiring is not reading like my other lmm it is not fluctuating so I need a diagram please for it and the frp sensor Thanks
Customer: replied 1 year ago.
I need the wiring diagram
Expert:  Pete replied 1 year ago.

I apologize for the delay.

Unfortunately I don't have the diagram info you are looking for on this here myself.I will open your question up for others here to see if someone else can assist further on this as there may be others here that may have more info on what to check or do with this issue.I hope you can get this resolved with ease.No need to reply to my last post here unless it is a last resort as it will keep your question locked to me and others will not be able to view it.If you feel you want to continue to work with me on this feel free to reply at any time but keep in mind in some cases it can be difficult to fully diagnose or help repair this without seeing your vehicle.

Thanks Pete

Expert:  Bluegorilla replied 1 year ago.

Do you still need assistance?

Customer: replied 1 year ago.
Expert:  Bluegorilla replied 1 year ago.

OK then. No need to reply.

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