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2001 Ford Lightning JLP built
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Discussion Starter · #1 ·
My 2nd post after 10+ years of just reading. My jlp built lightning with 2.6kb after 3yrs trouble free last week started runs really bad with fuel pressure fluctuating wildly. Then the next day fuel pressure was stuck at 40psi. I replaced the regulator with no change. Changed out the fp sending unit no change. Put my mitivac at -15 on regulator port no change. Stock rails, stock fpr and 255 walbros with stainless Y. What could have taken the fpr out of the loop
 

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268 Posts
Your fuel pressure is not climbing ? if it's not and rather lowering it can be either fuel pressure is set wrong in the adjustable one even though it it at 40psi it should be 43psi to be correct at wot 1:1 (ask me how I know ) or lines from fuel pumps are leaking or fuel pump connector isn't making full contact or might have a weak pump
 

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Professional Lackey
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442 Posts
When you replaced the FPR did you make sure the fittings where it mounted on the rail were free of any obstructions?
 
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