Fuel Pressure Tester
Cargo Master
Joined: Jun 2003
Posts: 3,292
Likes: 6
From: Ardenvoir, Washington
This is the one I got... easy install... works great...
7.3l Engine Mounted Fuel Pressure Guage
There is a fitting near the top of the fuel bowl..
7.3l Engine Mounted Fuel Pressure Guage
There is a fitting near the top of the fuel bowl..
Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 10
From: Snohomish, WA
Take a look at the picture below for the pressure port locations.
You can get a Fuel Injection Pressure Tester at most auto parts stores for around $40. You will need a fitting to thread into the fuel bowl once you remove the plug. The threads are 7/16-20 or #4 threads. It takes a #4 ORB fitting to seal up. You can use a standard #4 JIC hydraulic fitting, but you will need to put an o-ring on one side.
You can get a Fuel Injection Pressure Tester at most auto parts stores for around $40. You will need a fitting to thread into the fuel bowl once you remove the plug. The threads are 7/16-20 or #4 threads. It takes a #4 ORB fitting to seal up. You can use a standard #4 JIC hydraulic fitting, but you will need to put an o-ring on one side.
Thread Starter
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Elder User
Joined: Sep 2007
Posts: 684
Likes: 0
Take a look at the picture below for the pressure port locations.
You can get a Fuel Injection Pressure Tester at most auto parts stores for around $40. You will need a fitting to thread into the fuel bowl once you remove the plug. The threads are 7/16-20 or #4 threads. It takes a #4 ORB fitting to seal up. You can use a standard #4 JIC hydraulic fitting, but you will need to put an o-ring on one side.
You can get a Fuel Injection Pressure Tester at most auto parts stores for around $40. You will need a fitting to thread into the fuel bowl once you remove the plug. The threads are 7/16-20 or #4 threads. It takes a #4 ORB fitting to seal up. You can use a standard #4 JIC hydraulic fitting, but you will need to put an o-ring on one side.
So after I remove the plug I have two choices in fittings. One is 7/16-20 or # 4 thread,and the other is #4 JIC hyd fitting ? Either way I would need to use o-rings correct ?
I just want to have a set up to check fuel pressure when I do trouble shooting on 7.3 diesels. So looking for something quick to do not permanent.
SPONSOR
Joined: May 2010
Posts: 453
Likes: 18
From: Weldona, CO
Unless you have a very good buddy that is willing to crawl under the hood while you punch it going 60 MPH down the interstate to let you know what the gauge was reading, an underhood pressure gauge is pretty much useless. Fuel pressure readings while idling in the driveway do not tell you much about the operation of the fuel system on these engines.
You need an in-cab gauge that can be monitored over various operating conditions.
You need an in-cab gauge that can be monitored over various operating conditions.
__________________
Specializing in Viton® o-rings and leak repair kits for the 7.3L and 6.0L diesels
(970) 368-4455 aka guzzleguzzle's Mods & Maintenance website
Specializing in Viton® o-rings and leak repair kits for the 7.3L and 6.0L diesels
(970) 368-4455 aka guzzle
Thread Starter
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Elder User
Joined: Sep 2007
Posts: 684
Likes: 0
Unless you have a very good buddy that is willing to crawl under the hood while you punch it going 60 MPH down the interstate to let you know what the gauge was reading, an underhood pressure gauge is pretty much useless. Fuel pressure readings while idling in the driveway do not tell you much about the operation of the fuel system on these engines.
You need an in-cab gauge that can be monitored over various operating conditions.
You need an in-cab gauge that can be monitored over various operating conditions.
Thanks
SPONSOR
Joined: May 2010
Posts: 453
Likes: 18
From: Weldona, CO
Optimally, there would not be any drop throughout the power range but that is not what you will find in actual operation.
Keep in mind that fuel pressure that you will see on any gauge is dependent on the accuracy of the gauge itself and I have seen some that are WAY off. Normal range is usually found in a factory set up is between 55 and 60 psi if everything is working properly.
Normally you should not see more than about 5psi pressure drop between no load and full load on the engine. Anything more could indicate a restriction in the fuel system, weak fuel pump or a damaged Fuel Pressure Relief valve on the fuel bowl.
A dirty fuel filter could also affect the reading depending on which fuel port you may be using on the fuel bowl. The port on the driver's side is pre-filter and the passenger's side is post-filter.
Keep in mind that fuel pressure that you will see on any gauge is dependent on the accuracy of the gauge itself and I have seen some that are WAY off. Normal range is usually found in a factory set up is between 55 and 60 psi if everything is working properly.
Normally you should not see more than about 5psi pressure drop between no load and full load on the engine. Anything more could indicate a restriction in the fuel system, weak fuel pump or a damaged Fuel Pressure Relief valve on the fuel bowl.
A dirty fuel filter could also affect the reading depending on which fuel port you may be using on the fuel bowl. The port on the driver's side is pre-filter and the passenger's side is post-filter.
__________________
Specializing in Viton® o-rings and leak repair kits for the 7.3L and 6.0L diesels
(970) 368-4455 aka guzzleguzzle's Mods & Maintenance website
Specializing in Viton® o-rings and leak repair kits for the 7.3L and 6.0L diesels
(970) 368-4455 aka guzzle
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Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 10
From: Snohomish, WA
Thanks Ken for the picture . So I would the pressure ports,any one of the two ?
So after I remove the plug I have two choices in fittings. One is 7/16-20 or # 4 thread,and the other is #4 JIC hyd fitting ? Either way I would need to use o-rings correct ?
I just want to have a set up to check fuel pressure when I do trouble shooting on 7.3 diesels. So looking for something quick to do not permanent.
So after I remove the plug I have two choices in fittings. One is 7/16-20 or # 4 thread,and the other is #4 JIC hyd fitting ? Either way I would need to use o-rings correct ?
I just want to have a set up to check fuel pressure when I do trouble shooting on 7.3 diesels. So looking for something quick to do not permanent.
If you are using it to troubleshoot fuel pressure, the upper port is what I would use for no reason other than it is a little easier to get at!
The fuel tester I have has a flared fitting so I use #4 JIC fittings, if you make something up, you can use standard #4 ORB- 1/8" FNPT and get a hose rated for fuel to a standard gauge. You should have a pressure release on it too, since it makes it a little nicer.
Yes the fitting that goes into the fuel bowl will need an o-ring.
Bob has a good point for your own vehicle to mount a permanent gauge so you can monitor it while driving. He has the fittings on his site to adapt to just about any configuration you may need. Check them out HERE .
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