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fuel pressure test kit

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Old Feb 18, 2020 | 06:28 AM
  #1  
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fuel pressure test kit

Need suggestions for fuel pressure test kit for our trucks. Thank you.
 
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Old Feb 18, 2020 | 08:27 AM
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Old Feb 18, 2020 | 08:43 AM
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ajbrown208 might not have the time to wait for something from Amazon or Diesel-O-Rings if this kit is going to be used this weekend to help rjdj1186 and his no start condition...

Using the clues that Pirate posted, you can go to Napa or a local hydraulic shop and piece something together. Just need the fitting to bowl, hose to fitting and then gauge to hose. Luckily the hose can be short like a grease gun hose at 1' and the gauge is going to be used for somewhat low pressure with low or no pulsing, so a liquid filled gauge is not required.

Hope this helps sir and once again you are very generous to help out a fellow FTE'r in need!
 
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Old Feb 18, 2020 | 08:51 AM
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Local hydraulic shop for the -4orb male fitting x 1/8npt female... and 1/8npt female coupling. Then hit harbor freight for the 0-100psi liquid gauge and the 18" grease gun hose....youvuse the coupling to attach hose to gauge...
all you need
 
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Old Feb 18, 2020 | 10:16 AM
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Remove the hose from water drain valve on filter.

Attach 5/16” hose and a clamp to ANY cheap pressure gauge from the local hardware store. Air, water, etc gauge will be FINE for this test.

Tape the gauge to the outside of windshield and monitor pressure by opening by opening the water drain valve.

on edit: 100psi gauge works good. Factory pressure is ~55psi.
 
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Old Feb 18, 2020 | 10:56 AM
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Thanks guys. It is going to be used this weekend for the fellow in MO. May just be one time use, so cheaper the better. There should be three of us up there and one guy is a real life diesel mechanic with a 7.3. Hope to get this guys truck running fairly easy or in one day. I'm going loaded for bear, but hoping for a mouse. Anybody available on-line this weekend would be nice too. Where he lives is very remote and everything runs through his internet service. Phone, email, TV..... Pray for us and send us your best.
 
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Old Feb 18, 2020 | 10:58 AM
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Sounds like a good time!!

Good luck and keep us posted.
 
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Old Feb 18, 2020 | 11:22 AM
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Originally Posted by SkySkiJason
Sounds like a good time!!

Good luck and keep us posted.
Come on and go with us.
 
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Old Feb 18, 2020 | 12:33 PM
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We are towing the 5th wheel Saturday, but I will check into the FTE once we get set up. Be sure to create a new thread that is eye catching and makes it clear the advice is time sensitive if you do need to seek guidance.

I am hopeful it is something quick and obvious to a fresh set of eyes.

Be safe and we look forward to good news.
 
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Old Feb 18, 2020 | 01:01 PM
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Originally Posted by ajbrown208
Come on and go with us.
I’m working on getting back to a place in my life where I can do things like that!
 
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Old Feb 18, 2020 | 03:30 PM
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The 1/4 IN to 5/16 hose barb was challenging Mr. Jason. Now off to the part store for a piece of fuel line. Think I should pick up a fuel pump too?
 
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Old Feb 18, 2020 | 06:29 PM
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Originally Posted by ajbrown208

The 1/4 IN to 5/16 hose barb was challenging Mr. Jason. Now off to the part store for a piece of fuel line. Think I should pick up a fuel pump too?
Well played!

Low fuel pressure is often because of plugged filters in the tank. The other issue I see more and more is FPR o-rings are shot.

I do in-tank and pre-pump mods for ~$20 in parts.
 
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Old Feb 19, 2020 | 06:32 AM
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Can shot (worn out) O-rings for the fuel pressure regulator cause a non return in the fuel system? I understand they could leak if worn, but could it stop fuel flow altogether without leaking? Jason, do you have a parts list for in-tank pre pump mods? I guess one day I will join the hutch and harpoon crowd too.
 
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Old Feb 19, 2020 | 06:46 AM
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Usually FPR failures result in low pressure.

In-tank you’ll need:
- 3/8” compression union
- 6” or so of 3/8” tubing
- you’ll cut the fill and vent lines off as close to top of tank as possible (PVC cutter)

On edit: I like to put a 90* bend on the bottom of pickup like this so I can put the suction directly on the tank bottom.







Pre-pump:
- 12” of 5/16” 30R9
- WIX 33972
- (4) fuel injection hose clamps






 
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Old Feb 19, 2020 | 07:23 AM
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Jason, I notice you do not eliminate the quick disconnect at tank. It is my understanding that air can enter the fuel system, on the suction side thro the quick disconnect which is why most eliminate them. Any thoughts on supporting or debunking that theory? I tend to think of this theory as plausible simply because the rest of the fuel system is pressurized and should not allow any air into the system.
 
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