Compression Ignition Addict
Join Date: Oct 2006
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Those fill caps suck.
I removed it and had an aluminum neck welded in.
Likely, the seal between the flange and the tank is leaking. Remove the screws and reseal, then reinstall.
While the fill cap is in hand, be sure to clean it. There is a vent in the cap. Its under the allen head screw. clean it up nice and reinstall.
A 1/4 cup of sodium hydroxide in a gallon of water will make it like new.
Be sure to use gloves, NaOh is potent, and dangerous.
99 F350 7.3
320K w/ 150k+ on Biofuels
Casserly Stage 2's-TE Modded 17 HPOP
DP Tuner F6 & PMT1-Van Turbo Non EBPV & 6637
Twin Fass Pumps B100 & D2 Regulated Return- Fuel Lab
Isspro Pyro, Trans, Boost-Air and Fuel Temp
WVO processed by Simple Centrifuge
B100 by Biopro 190
B100 powered Excursion, F250 CCSB, and Two TDI Jettas