Join Date: Aug 2010
Location: Sassamansville, Pa
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The original Ford fuel pressure spring gets weak over time, this spring regulates the fuel pressure going to the injectors. When fuel pressure drops below 45psi from idle to WOT, you take a chance of destroying injectors.
Ford realized this, and came out with a upgraded spring that is stiffer to maintain fuel psi above 45psi from idle to WOT.
This is why it's very important to have a fuel pressure gauge, so you can monitor when/if psi drops too low. Just because you installed a upgraded spring, don't think that you shouldn't get a fuel psi gauge, you may never know when/if the HFCM gets weak.
2004 F350 CC DRW King Ranch
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