F150 breathing problems
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Joined: Jul 2013
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Have you changed the fuel filter with 240kmi on it, you need fuel pressure gauge, to check fuel pressure, at the least it needs to be 30-32psi at idle, and when you remove vacuum line from the fuel pressure regulator, it should go/jump up to 38-40psi depending on how low it reads at idle, then if that checks out ok, need a longer hose to be seen while your driving and someone watch gauge while you drive, I've zip-tyed mine to windshield wiper and had friend watch while I drove, and write down what he see's so he dont have to remember, is safest way
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No next thing you should do is pull codes and check fuel pressure. If you don't have a code reader then now is the time to get online and order a bluetooth OBD2 module to use with your phone, with your truck you can not only see and clear codes with it you can also see realtime data which can be really helpful when diagnosing problems.
Fleet Owner
Joined: Oct 2005
Posts: 20,789
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From: Kentucky
30 PSI at idle is considered normal, maybe a bit low but not bad. What is the pressure at idle with the vacuum line removed from the fuel pressure regulator?
What is the pressure under load? 30 PSI while driving down the road is too low. As the load increases, vacuum decreases, the fuel pressure should increase. Full load/wide open throttle is in the 40-42 PSI range.
What is the pressure under load? 30 PSI while driving down the road is too low. As the load increases, vacuum decreases, the fuel pressure should increase. Full load/wide open throttle is in the 40-42 PSI range.
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