CHECK 1, 2–CHECK 1, 2

Mustang Monthly - - WEEKENDPROJECT -

If you’re at all fa­mil­iar with the late-’80s to early-’90s Mus­tang EFI sys­tems, you’ll know that Ford pro­vided a small check valve you could screw a fuel pressure gauge to in or­der to ver­ify fuel rail pressure. When up­grad­ing to an af­ter­mar­ket EFI so­lu­tion, gen­er­ally it is com­mon prac­tice to in­stall a fuel pressure gauge in the ex­ter­nal fuel pressure reg­u­la­tor so you can set your fuel pressure man­u­ally on the reg­u­la­tor. With these throt­tle body–based sys­tems like the Holley Sniper setup you see here, the fuel pressure reg­u­la­tor is built into the unit and is pre-set from the fac­tory, so why would you need a fuel pressure gauge? Right off the top of our

head, the quick an­swer is to ver­ify fuel pressure from your fuel pump, but it can also be used as a di­ag­nos­tic tool to show a weak pump, re­stricted fil­ter, dam­aged/crushed fuel line, etc. Earl’s of­fers liq­uid­filled fuel gauges in both car­bu­reted and EFI ranges (we grabbed the 0-100 EFI, PN 100187ERL) and this nifty AN -6 gauge adapter, PN AT100199ERL. Us­ing the gauge adapter, we can eas­ily in­stall the pressure gauge in­line be­tween the sup­ply line and the throt­tle body for ini­tial startup and test­ing, and then re­move it and store it in our tool­box for fu­ture pro­jects or EFI sys­tem di­ag­nos­tics.

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