Fuel pressure issues - Dodge Cummins Diesel Forum
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post #1 of 13 (permalink) Old 10-14-2019, 10:53 PM Thread Starter
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Fuel pressure issues

Here’s the deal, I’m having fuel pressure issues according to my edge. I drove about 500 miles parked over night temps got into the 20’s started the next morning like normal let it warm up and drove it into town, when I got on the main road about quarter throttle in my edge started beeping and My fuel psi dropped to 3 and stayed like that till I let off. I let off about 5 seconds later and just eased it up to speed. My normal fuel psi cold or hot is 13-14 at idle and 11-12 @ wot. I have a air dog 125 and wix filters. Stock pump removed. Edge juice like mentioned earlier. Filters changed within the last 2500 miles. Any ideas what’s going on with the truck? Fuel temps were normal 60* ish when cold and 98* when warm

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post #2 of 13 (permalink) Old 10-15-2019, 02:30 AM
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It would not be normal for gelling at that temp but you will have to compare it to late afternoon, maybe after running for a couple of hours to warm the fuel by the motor. and see if it is happening when warm.
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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 #3 of 13 (permalink) Old 10-15-2019, 10:23 AM Thread Starter
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Yes it does it when warm or cold now. Seems like the fuel psi doesn’t fluctuate as bad when warm but I still see some un wanted numbers at throttle still. So yes it does it warm and cold. Morning or evening
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post #4 of 13 (permalink) Old 10-15-2019, 05:35 PM Thread Starter
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Drove the truck for 4 hrs today and the fuel pressure got slightly better the warmer the fuel got but still not back to normal. At half throttle Im getting 2 psi
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post #5 of 13 (permalink) Old 10-15-2019, 09:15 PM
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If you have nothing like a clogged filter or other intake restriction you likely have a bad Airdog, not the first lately. Also check the spring in the Schroeder valve for broken. It is possible they break and do not hole proper pressure.

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 #6 of 13 (permalink) Old 10-15-2019, 11:20 PM Thread Starter
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Thank you big fish I will check all that out tomorrow morning and let you know what I come up with
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post #7 of 13 (permalink) Old 10-16-2019, 01:05 AM
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A couple of my airdog pumps were having erratic fuel pressure, the pressure relief valve on the return line fitting was stuck. (By stuck the ball was stuck in the spring) I'm not sure if the newer pumps are the same. Something to look into.

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post #8 of 13 (permalink) Old 10-16-2019, 10:13 PM
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I have to pull the spring/make it a bit longer on the relief valve on my Holley pump every once inna while to get the pressure back up..

'01.5 QC, SB, 6spd 4x4, Drag Comp, 4" exh. Jammer 100's, 62-65-.70A/R WG, adj.boost elbow Big Line, fuel press.pyro & boost gauges fuel cooler BHAF, Black Holley lift pump-12psi WOT Ceramic/Kevlar SD clutch, studs Take time to turn-so you don't burn
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post #9 of 13 (permalink) Old 10-17-2019, 02:59 AM
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If it ain't broke I would not mess with it. If it is broken, relocate it.

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 #10 of 13 (permalink) Old 10-17-2019, 04:24 PM Thread Starter
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Fixed the issue fellas, on my return line like you guys said there was a spring with a ball and the ball was stuck up in there I pulled the ball and bent the spring so the ball wouldn’t find it’s way back in, now back up to 14-15 psi constant. Thanks for all the help guys!
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post #11 of 13 (permalink) Old 10-17-2019, 04:42 PM
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Quote:
Originally Posted by Joe_00Cummins View Post
Fixed the issue fellas, on my return line like you guys said there was a spring with a ball and the ball was stuck up in there I pulled the ball and bent the spring so the ball wouldn’t find it’s way back in, now back up to 14-15 psi constant. Thanks for all the help guys!
Glad you got going!

2002 ram 2500 quad cab shortbed ST. Red, 4x4, nv4500 swap 24v, 66mm silver bullet, 100hp injectors , fass titanium 150, 4" exhaust, guages. 190k miles.
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post #12 of 13 (permalink) Old 10-17-2019, 10:00 PM
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Thanks for the update!

'01.5 QC, SB, 6spd 4x4, Drag Comp, 4" exh. Jammer 100's, 62-65-.70A/R WG, adj.boost elbow Big Line, fuel press.pyro & boost gauges fuel cooler BHAF, Black Holley lift pump-12psi WOT Ceramic/Kevlar SD clutch, studs Take time to turn-so you don't burn
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