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Message: [QUOTE="old man dave, post: 1518159, member: 1009"] The stock fuel fittings on the head is 1/8" NPT. So what you need is a NPT to AN-6 male fitting if you go to AN-6 lines, usually a hard 90* cast fitting. Select one that will clear the turbo. Some have used all four fuel rail fitting holes without using the fuel rail fitting on the firewall side of the head for more flow. (There is a second set of plugged holes at the front of the head). If you want to change out the fuel rail plugs on the back of the head, you need a fuel rail plug to AN-6 adaptor fitting. Diesel Innovations may still sell this adaptor. To hook up to this fitting, you need a close 90* AN-6 male to AN-6 female sweep bend fitting. You then make up the AN-6 hose with a female fitting. The hard 90* cast fittings restrict flow. Aeroquip is the only one who sells this fitting that will clear the firewall. The normal 90* wide sweep bend fittings do not clear the firewall. This close sweep bend fitting comes in aluminum and steel. Unfortunately, I can't find the part numbers for either fitting at this time. If you use pushlock hose instead of AN hose, then several make the close sweep bend AN-6 female to male hose barb fitting. [/QUOTE]

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