Fuel Pressure Test Question

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Oct 29, 2014 | 06:05 PM

tr0y

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Tuned

Joined: Jul 2004

Posts: 335

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From: Las Vegas

Fuel Pressure Test Question

I need to test fuel pressure in my truck as to rule out an issue with the truck chugging.

I purchased a fuel pressure gauge with a long enough hose to see while driving, but fitting it is an issue, it doesn't have the proper fittings for the back of the fuel bowl.

I can go to the hardware store and get the right size fittings but I was wondering if I needed a special fitting with a shrader valve in it to allow fuel into the gauge or will the fuel pressure be enough and the valve in the tester is just there to make sure it holds pressure once it gets a reading .

Thanks

T

Oct 29, 2014 | 06:23 PM

Pikachu

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Joined: Jun 2004

Posts: 6,362

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From: Amarillo, TEXAS!

You need a -4 ORB male adapter to whatever thread your gauge uses, probably 1/8" NPT. Most hardware stores won't have that, but most hydraulics shops will.

Oct 29, 2014 | 07:12 PM

whitetmw

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Joined: Oct 2008

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1/8" NPT straight pressure port adapter.

Jun 23, 2016 | 10:46 PM

RSuperDuty13

New User

Joined: Jun 2016

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06//96 model year F150 XL

Removed valve from fuel pressure regulator to test flow of fuel and it was flowing during cranking and stopped when turned off. Diagnosing fuel pressure regulator is that a valid test during crank no start scenario?

Jun 24, 2016 | 07:00 AM

AllaboutMPG

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Joined: Oct 2011

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From: Mcdonough, GA

Quote:

Originally Posted by RSuperDuty13

probably want to post your question in the F150 forum as the 7.3 diesel is a completely different animal.

Jun 24, 2016 | 09:37 AM

Talltruck

Senior User

Joined: Dec 2002

Posts: 473

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From: SW Florida

There are two ports on the back of the fuel filter housing. One is the bowl pressure and the other is the outlet pressure that goes to the heads after the check valve. Make sure you're testing the outlet pressure; it's possible to have the correct bowl pressure and for the truck to still not start. The outlet port will be the one on the passenger side, both have the same threads.