Need to hook up a second fuel pressure gauge - Dodge Cummins Diesel Forum
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post #1 of 13 (permalink) Old 07-20-2014, 11:35 PM Thread Starter
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Need to hook up a second fuel pressure gauge

My Fuel pressure was 6 this afternoon when I went out to my truck, Fass comes on, sounds normal, took off return line, its pumping a healthy amount of fuel seemingly (to the eye), but gauge isn't reading that I have good pressure, second time I turned the key it only read 2 psi.

My question is how do I hook up a gauge under hood and what type of gauge do I need? I have the fuel line T'd off the main line from the Fass to the VP.

Thanks in advance


2001 2500 qcsb, NV4500, 4in. turbo-back, BHAF, Edge Comp, FASS150 with sump, Isspros, BorgWarner 63/68/.80 t3 gated with DFI 7x.011, Valair ceramic dual disk
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post #2 of 13 (permalink) Old 07-20-2014, 11:45 PM
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What type of gauge are you using now?

"I didn't choose the '91.5z lyfe; the '91.5z lyfe chose me."

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post #3 of 13 (permalink) Old 07-20-2014, 11:54 PM Thread Starter
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ISSPRO mechanical gauge and I am using an isolator to keep the diesel out the cab

2001 2500 qcsb, NV4500, 4in. turbo-back, BHAF, Edge Comp, FASS150 with sump, Isspros, BorgWarner 63/68/.80 t3 gated with DFI 7x.011, Valair ceramic dual disk
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post #4 of 13 (permalink) Old 07-21-2014, 12:00 AM
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Originally Posted by TB612 View Post
ISSPRO mechanical gauge and I am using an isolator to keep the diesel out the cab
Sounds to me like the isolator might be your problem.

Either go to an auto parts store and get a fuel pressure test kit, and thread that into the 1/8" port on your tee, or just remove your isolator and directly plumb your ISSPRO.

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post #5 of 13 (permalink) Old 07-21-2014, 12:04 AM Thread Starter
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I will mess with the isolator once I get a pressure test kit on it to diagnose that it isn't a problem to drive. I am currently 300 miles from home at my parents.

The isolator is so simple (just a diaphram between diesel fuel, and coolant to the gauge) the only thing that could go wrong in my mind is the diaphram rupturing, which would simply allow diesel fuel to leak through, but that would still create pressure against the gauge port I think. unless the diaphram ruptured and then clogged the port at the back side of the gauge

2001 2500 qcsb, NV4500, 4in. turbo-back, BHAF, Edge Comp, FASS150 with sump, Isspros, BorgWarner 63/68/.80 t3 gated with DFI 7x.011, Valair ceramic dual disk
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post #6 of 13 (permalink) Old 07-21-2014, 05:35 AM
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You can screw a 20 dollar manual gauge into the top of the fuel filter housing and check it against your gauge without messing with anything.

99 2500, Quad cab, 4x4 47RE, BD pressure lock on it, small BD 90/140 chip on the VP 44 connection plug, 17" 3rd gen wheels. 3.55 diffs. Ruenell front bumper and warn winch, Rancho adj shocks. 663k miles.
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post #7 of 13 (permalink) Old 07-21-2014, 09:40 AM
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You can screw a 20 dollar manual gauge into the top of the fuel filter housing and check it against your gauge without messing with anything.
He doesn't have a stock fuel filter housing.

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post #8 of 13 (permalink) Old 07-21-2014, 04:34 PM
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I take it you are saying the aftermarket ones do not nave a 1/8 in pipe tread port in them? Guess he is screwed then. He will have to make a fitting fit somewhere.

99 2500, Quad cab, 4x4 47RE, BD pressure lock on it, small BD 90/140 chip on the VP 44 connection plug, 17" 3rd gen wheels. 3.55 diffs. Ruenell front bumper and warn winch, Rancho adj shocks. 663k miles.
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post #9 of 13 (permalink) Old 07-21-2014, 04:43 PM
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Check at the back of the gauge to see if the line is full. People have had issues with losing the antifreeze & getting bad readings.

Ed

2001 2WD SCLB (ex fleet truck) 237,000 stock rebuild on 47RE, BHAF, 4" w/ muffler w/ turndown, Quad Adrenaline with pod, FRRP, 3.55
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post #10 of 13 (permalink) Old 07-21-2014, 06:19 PM
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You know I have the same set up and could smell diesel fuel in my coolant side of the issolator

Might just go to a straight line and delete the issolator. Too many brass fittings anyways!

2001 Cummins auto 24v --2013 jetta TDI- Bilstein5100
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-Isspro EV2 Boost and FP 305/75/16 nitto grapplers
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post #11 of 13 (permalink) Old 07-21-2014, 11:13 PM
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Quote:
Originally Posted by bigfish95971 View Post
I take it you are saying the aftermarket ones do not nave a 1/8 in pipe tread port in them? Guess he is screwed then. He will have to make a fitting fit somewhere.
Quote:
Originally Posted by TB612 View Post
My Fuel pressure was 6 this afternoon when I went out to my truck, Fass comes on, sounds normal, took off return line, its pumping a healthy amount of fuel seemingly (to the eye), but gauge isn't reading that I have good pressure, second time I turned the key it only read 2 psi.

My question is how do I hook up a gauge under hood and what type of gauge do I need? I have the fuel line T'd off the main line from the Fass to the VP.

Thanks in advance
____________________

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post #12 of 13 (permalink) Old 07-21-2014, 11:29 PM
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you would need a tapped banjo bolt that replaces the factory inlet banjo bolt at the vp and just plumb a mechanical gauge off that. as far as a gauge goes. 30 psi gauges is all you need. we use the liquid filled gauges.

Get off my lawn.
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