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Discussion Starter #1
I have an 05 6.0. I did the blue spring mod a few years back. Checked fuel pressure today and key on engine off come up to 51, and also idled at 51. A couple blips of the throttle and it come down to 49. Does anyone know if the blue spring gets weak? Maybe I just need another spring. I wouldn't think it would be the pump with the KOEO showing 51 with no fuel even being consumed, but who knows.
 

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3,409 Posts
Key On Engine Off should show just the pressure from the pump.
 

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Ford fanatic
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Discussion Starter #3
I answered my own question. I pulled the spring out, stretched it and put it back in. KOEO was at 60 psi, idle at 60, and a few blips of the throttle barely moved it. I don't think the stretched spring will hold too long so I bought another spring and will put it in tmr and test the press again.
 
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