Fuel Pressure tester

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Sep 2, 2014 | 08:55 PM

TruckingBill

Thread Starter

Freshman User

Joined: Apr 2009

Posts: 49

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Fuel Pressure tester

I am looking to add a tool to my toolbox.

Will this fuel pressure tester gauge at Harbor Freight work on 6.0 L or is there a specific gauge I have to get?

Here the link - Fuel Pressure Tester & Fuel Injection Pump Tester

Bill

Sep 2, 2014 | 09:13 PM

texastech_diesel

Token Redneck

Joined: Jun 2007

Posts: 9,337

Likes: 346

From: Breckenridge, TX

If you can't read it while you're driving it's kind of useless. Base fuel pressure at idle can be well up into the 50s and you'll see down into the 30s at WOT.

Sep 3, 2014 | 12:09 AM

Yahiko

Fleet Owner

Joined: Apr 2012

Posts: 27,307

Likes: 549

From: Spanaway

When doing just a basic test I use this one.
Engine Oil Pressure Test Kit

But texastech_diesel is right when it comes to driving.
Also you DO NOT want any fuel in the cab in case of a line
failure.

If you want to keep an eye one pressure as you drive you better off with electronic.

If you just testing it there is a post on what size orifice to use to simulate WOT.
Just use the search function at the top of the forum.

Sean

Sep 3, 2014 | 12:18 AM

Mr.Nobody

Elder User

Joined: Apr 2013

Posts: 941

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From: Bothell, WA

Does that kit have the proper bushing to screw the guage in? Or do you still have to buy that separate?

Sep 3, 2014 | 12:23 AM

Yahiko

Fleet Owner

Joined: Apr 2012

Posts: 27,307

Likes: 549

From: Spanaway

I think I got mine separately on Ebay. Not sure if it
comes with one or not. Also everything in that kit
is non O-ring.

Sean

Sep 3, 2014 | 05:03 AM

WatsonR

Lead Driver

Joined: May 2014

Posts: 6,545

Likes: 13

From: Virginia Beach VA

Quote:

Originally Posted by texastech_diesel

If you can't read it while you're driving it's kind of useless. Base fuel pressure at idle can be well up into the 50s and you'll see down into the 30s at WOT.

Pressure in the 30s.... isn't that a problem?

Sep 3, 2014 | 06:20 AM

jsm180

Fleet Mechanic

Joined: Nov 2012

Posts: 1,348

Likes: 110

From: Lakeland, Fl

I don't put too much faith in the HF gauges, I have found them to be very inaccurate. Replace the gauge with an accurate one or check the accuracy before each use.

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Sep 3, 2014 | 08:01 AM

mustang_309

Logistics Pro

Joined: Dec 2004

Posts: 4,138

Likes: 7

From: South Weber, Utah

Quote:

Originally Posted by WatsonR

Pressure in the 30s.... isn't that a problem?

That is what he was getting at, just because your fuel pressure at idle in your driveway is at 50 PSI doesn't mean everything is ok, it needs to be tested under load at WOT.

Quote:

Originally Posted by f350project

I believe if I'm not mistaken dynamic fuel pressure (driving pressure) shouldn't go below 40 PSI or you may start killing injectors due to starvation.

You are correct except the number is anything less than 45 PSI can and will cause damage depending on how far below 45 it goes.