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Ho guys i posted yesterday about my international 06 4400. We had a code for ICP so we replaces that and code went away but we still are only at 47psi and 50psi with the pedal to the floor it has a new fuel filter a new hand primer pump they were both faulty. We also changed the IPR and still have low fuel pressure pease help!!
 

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You take out your fuel filter underneath the fuel filter there's a quarter inch Allen key take that piece out that is the fuel pressure regulator I just change that myself that may solve your problem $118 in Suburban New York. I hope this helps good luck
 
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