Fuel pressure test fitting

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Oct 7, 2005 | 12:46 PM

formula350sd

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From: Lombard Il

Car: 89 Formula

Engine: 383 vortec tpi

Transmission: t56 woot

Fuel pressure test fitting

does anybody know what size fitting they use for the fuel pressure test port on late model gm engines I need to know so I can get adapters (if i need) to hook my car up to a injector cleaning system andy help is appreciated

Oct 9, 2005 | 01:40 PM

Vader

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What year? What engine/fuel system? The fittings vary depending on system type. TPI is different than CPFI. LT1 is also different.

Oct 9, 2005 | 04:17 PM

TheMysticWizard

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From: San Lorenzo, California

Car: 1987 Firebird Trans AM

Engine: 383 TPI...very soon

Transmission: TH700R4

I remember reading that the TPI one is -4an.

Oct 9, 2005 | 05:33 PM

Dialed_In

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From: MD

Car: '88 IROC-Z medium orange metallic

Engine: L98

Transmission: 700R4

Axle/Gears: 3.27

TPI and LT1 are the same, as are most late model GM's. Even the LS1. Not sure on the size but it's the same as a valve stem on a tire. -4 sounds close.