What is your question?
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What is your question?
My fuel psi has been at 43.5 and won’t get any higher. It cold starts and sits just fine but will stall after driving and heating up. We replaced the fuel pump and we thought that fixed the problem but it is still stalling. Any thoughts?
What makes this problem better or worse?
When the engine is hot
How long has your 2008 GMC Yukon XL 1500 had this problem?
3 weeks
1 Reply
I don't think you're looking at a fuel concern, although key on - engine off fuel pressure should be 50-60 PSI with a proper operating gauge at the fuel rail. You could have a loss of ignition spark, you could have an air intake concern. It doesn't just have to be a fuel concern. The vehicle starts right back up after stalling?
Thanks for responding. Right now we are at 50-51 while idling. It only stalls after being hot, and then it doesn’t start up again until it cools down. Could it be the fuel pump module? When it runs rough and we have most of the issues it’s running around 40-43 psi
I don't think fuel pressure / operation is your issue. Look further into air intake concerns and ignition spark. Diagnostic testing is essential. Do you have any diagnostic trouble codes?