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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / May 2007Mercury 5.0L fuel pressure
Measured the fuel rail pressure. Key on, engine off, I get 40 PSI, which seems fine. Engine idling, I get 26 PSI, which intuitively seems low. I can't find a spec. Should it be higher?  SignatureBoycott KFC http://www.telegraph.co.uk/news/main.jhtml?xml=/news/2007/05/10/nkfc110.xml >Measured the fuel rail pressure. Key on, engine off, I get 40 PSI, which >seems fine. Engine idling, I get 26 PSI, which intuitively seems low. >I can't find a spec. Should it be higher? Fuel pressure is controlled by engine vacuum. Higher vacuum = lower fuel pressure. This can happen if timing is overly avanced resulting in high vacuum. Normal readings in most 5.0L vehicles is 32-35 at idle - all accessories off. A good service manul has a vacuum/pressure relationship chart. Lugnut |
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