1995 hard starting - Page 2 - Dodge Cummins Diesel Forum
94-98 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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post #13 of 23 (permalink) Old 01-31-2019, 09:09 PM
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Have you actually changed the fuel filter and the pre-screen? What have you actually done to this point?


'97 3500 4x4 CC DRW, 4.10, Banks PP, BD tc, vb, eb, 60# springs, Torqloc, gauges, Weatherguard, B&W...
'92 CC W350 DRW sold
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'92 CC D350 DRW sold '12 Laramie CC 3500 4x4 SRW sold
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post #14 of 23 (permalink) Old 01-31-2019, 09:43 PM
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Quote:
Originally Posted by 6537jim View Post
does the
lift pump have some kind of valve to prevent fuel from bleeding off?
The return line is usually submerged so it can't bleed back unless there is a leak in the return line. Try pumping the primer until you hear the ofv squeak and see if that makes a difference

p.s. Do you notice any difference with fuel levels? Do you park on a steep driveway?

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2004 2500 Laramie 2wd 305hp QCSB 6spd 3.73 200k stock
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post #15 of 23 (permalink) Old 01-31-2019, 10:19 PM
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My 1996 did this. I found my return line was the issue. Start the truck and look at the
return line that runs along side the block on the drivers side.

If it has bubbles coming from it, you have porosity in that hose. It causes the system to suck air into it when the engine is off and allows the fuel to run back into the tank.

The lift pump takes a long time to prime the system again. It's an easy fix!

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post #16 of 23 (permalink) Old 02-01-2019, 12:04 AM
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You can also pressurize the fuel tank around 10psi then go look for leaks.

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91.0 D250 A727 w/ 216k on the clock. i/p replaced 20k ago, lift pump 2k, 1 turn fuel, 2 turns smoke, ground & polished AFC pin, timing bump, 366 spring 94 2500 4x4, 49k miles, Farrell Diesel rebuilt 215 pump, PDD 5x12 SAC, SXE 362, built 47RH
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post #17 of 23 (permalink) Old 02-05-2019, 12:30 PM Thread Starter
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hey guys
I checked the fss today I removed it and tied up the lever on the pump to the run position and no difference.
I changed the fuel and cleaned the pre-screen filter less than 8k miles ago. I also changed the 2 rubber lines near the trans
to marine grade hose I retightened the clamps as well. I also dropped the tank and checked all the lines they appear to be ok
I guess the next step, would be to install clear hose to both supply and return steel line and draw fuel from a 5 gallon container and check for air bubbles? I believe urdiesel is probably right if fuel is bleeding off the LP will take time to prime up the system. that's
why the pressure gauge is rising slowly. I was wondering doesn't the IP have enough fuel after sitting overnight to at least fire the truck up quickly? thanks

P.s. also changed ofv to tork tech
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post #18 of 23 (permalink) Old 02-05-2019, 02:25 PM
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If the fuel lines between the tank and the lift pump or the return line to the tank is the cause you will not see any fuel leaking. Air can enter, but as a general rule the lines are not porous enough for fuel to leak if not under pressure. I think your next step is to pressurize the tank using something to seal the filler like a rag and attempt 10 or 15 psi. Have a helper inspect every inch of fuel line from the top of the tank to the lift pump.
Any air leaks before the lift pump will show up as bubbles. Since I don't live in the rust belt my original fuel lines along the frame are intact, so I disconnect the rubber line that is near the bell housing from the steel line and pressurize the system there using a little air nozzle and regulated pressure at 15 psi. On the two occasions I had an air leak I found one at the elbow going into the lift pump (wasn't tight enough and took another revolution). The other was the square cut gasket (Cummins #3923194) shown in Joe G's writeup. For reasons unknown to me no one has sent you to that link.
https://www.cumminsforum.com/forum/9...m-writeup.html

In a nutshell a good system's OFV acts as a check valve that keeps fuel in the IP and the fuel lines from draining back to the tank. So no, in a faulty system there is not enough fuel after sitting overnight to at least fire the truck up quickly.

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post #19 of 23 (permalink) Old 02-05-2019, 05:38 PM Thread Starter
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hey guys
thanks for that link I remember on another diesel truck I had a leak on the suction line back by the tank I was lucky enough to hear
it and just replaced a clamp to fix that. I'm going to go over all the supply lines again and maybe I will replace that fiber washer
for good measure also maybe hook up a rubber line to inlet on lift pump from a 5 gallon can run the truck that way. thanks
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post #20 of 23 (permalink) Old 02-05-2019, 06:04 PM
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The fiber washer isn't a simple job, so I wouldn't replace it if there isn't a air leak there.

97 3500, 2 WD, G56, slightly bombed, 1.3 million miles. Started the second million on 8/24/13
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post #21 of 23 (permalink) Old 02-09-2019, 03:09 PM Thread Starter
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Hey guys
I spent some time with the truck today I installed a clear hose on the supply side from the trans to the engine
ran the truck air bubbles. I dropped tanked installed a clear hose from the sending unit to the frame rail
ran the truck get air bubbles from the the tank. I removed the fuel sending unit disassembled it
clean the two screens tested the supply line for leaks everything ok. reinstalled ran the truck still getting air.
Does the fuel sending unit have a check valve to prevent fuel from bleeding back into the tank. The tank has over 1/8
tank and is sitting level on the concrete. Is the sending unit bad? Is air from the tank normal? I quickly clamped off
the supply line just above the fuel sending unit after shutting it down. I will try and start it up tomorrow morning
see if it starts quick. I also put 12-13 psi of pressure on the fuel supply from the frame rail just above the sending unit
sat all night and was still holding 10-11 psi this morning. Thanks
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post #22 of 23 (permalink) Old 02-09-2019, 03:16 PM
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Sounds like to me the fuel tank module is the problem, is it sitting at the bottom of the tank.? The module is adjustable and may have over the years moved up and so it isn't sitting on the bottom of the tank.

Also my module had a steel 90 for the supply at the module and was rusted and was letting air into the system.

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post #23 of 23 (permalink) Old 02-10-2019, 05:47 PM Thread Starter
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hey guys
I went to my shop today and removed the hose pliers from the clear fuel line at the gas tank and the
truck started right up I let it run for a while and all seemed well. I left the truck tonight and I did not
clamp off the clear supply hose at the tank. I will see what it does tomorrow am. I did notice before leaving some
fuel bleeding off back into the tank. also my unit has plastic supplu fitting on the sending unit.
thanks
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