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Permanent Fuel Rail Pressure Gauge

Old 01-04-2014, 05:27 PM
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Join Date: Jan 2014
Location: Sweet Home Alabama
Posts: 31
Year: 1991
Model: Comanche
Engine: 4.6L Hesco Stroker
Default Permanent Fuel Rail Pressure Gauge

Here's a simple little mod that saves you time by enabling you to check your fuel pressure any time you want. The parts:
1.) A 0-60 PSI liquid-filled 1-1/2" fuel pressure gauge from Jegs, p/n 555-41012
2.) A brass 1/4" flare x 1/8" female NPT straight adapter fitting from here: http://www.casperselectronics.com/st...oducts_id=1337

Use teflon tape on the gauge pipe threads then snug it on the adapter:
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After the engine has been sitting overnight and is cold, let any fuel rail pressure off first by depressing the needle. Have a rag handy in case the fuel squirts out. Then remove the core needle from the fuel rail Schrader valve w. an extractor tool, same tool used for bicycle tires.
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My ever-present red-eyed helper:
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Screw the assembled gauge and adapter on the Schrader valve. Since it's a flare, do not use teflon tape, and do not over-tighten:
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Start 'er up and check for leaks. Hmmm, I'm about two PSI low:
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