Join Date: Aug 2010
Location: Sassamansville, Pa
Thanked 196 Times in 157 Posts
Mentioned: 6 Post(s)
Quoted: 0 Post(s)
Feedback Score: 3 reviews
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
X-3 tunes by DJ'S,QT,GH,ID. Gryphon FICM tunes, ARP studs,Stage 1turbo,ATS coolant recirc lines,Swamp's 48v ficm,coolant filter,AD2,Snow Perf stage II,EGR delete,4" turbo back straight pipe,S&Bintake,Quad "A" pillar autometer gauges,Suncoast Tri Disk Conv.,Billet input shaft,Suncoast superduty rebuild kit,Trans-go shift kit,Mag-Hytec trans pan,CFM+ elbow,ccv mod,15K reese 5er,17" LCD TV/DVD,Cobra 29 Nitewatch CB