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Engine/Transmission (1994 - 1998) Fuel line replacement options

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2nd Gen Non-Engine/Transmission lift pump mounting

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Have a leak and hard start situation. Couple that with the fact that I found a small puddle under the truck, and I think it is time for new lines.



Last time I did this, I had to just replace the lines at the top of the pump. I just want to be done with it though and will replace everything up to the filter. Is there a flexible line that anyone could recommend? After working with PEX plumbing, I am hoping there is something out there along these lines but am looking to the brain trust here to help me out. Two small babies preclude me from doing much else today in terms of investigation.
 
I think you are stuck with rubber fuel lines. Not that bad to replace, on mine anyway. Remove the fuel filter for easier access to the return line and either take a picture of the way the lines are routed or rely on your memory (That really worked for me:-laf). The L shaped hose between the prefilter and the pump might be easier to access from inside the wheel well with the tire and liner removed. Dodge dealer price for the last one I bought was about $7.
 
I just went to NAPA and got their "multipurpose" hose that is good for diesel, oil, etc to 350 psi. The hose from prefilter to lift pump is 1/2" diameter and you should only need about 5-6" for that piece. As for the other pieces I am not sure.

Also consider bypassing you pre-heater while you change the fuel lines as it is prone to air leaks.
 
The hose from prefilter to lift pump is 1/2" diameter and you should only need about 5-6" for that piece.



And how do you make that 90 degree bend without collapsing the hose? That could very well be why a preformed hose applies. Could be wrong though, guess you could put a big loop in it.
 
And how do you make that 90 degree bend without collapsing the hose? That could very well be why a preformed hose applies. Could be wrong though, guess you could put a big loop in it.



I bypassed the entire assembly so my fuel line now goes directly from hard line into lift pump. Made a big difference on starting, power and reduced smoke. I can only conclude that my pre-heater was leaking.



Another option would be to change the factory 90 to a 45 or straight fitting. I like the option to get universal parts instead of dealer only as dealers are only convenient with your are not stuck on the side of the road.
 
I bypassed the entire assembly so my fuel line now goes directly from hard line into lift pump.



How does that correlate to "The hose from prefilter to lift pump is 1/2" diameter and you should only need about 5-6" for that piece. ":confused:

You have bypassed the prefilter apparantly, not something I would do. Removing the fuel heater while still using the prefilter makes more sense to me.
 
How does that correlate to "The hose from prefilter to lift pump is 1/2" diameter and you should only need about 5-6" for that piece. ":confused:

You have bypassed the prefilter apparantly, not something I would do. Removing the fuel heater while still using the prefilter makes more sense to me.



The hose size is 1/2" was just for information. When I was looking into the preheater and leaks, the information online was very vague and did not have any sizes of lines or fittings. I had to pull my line and wait for NAPA to open the next day to get the right hose. I don't want anyone else to have the same experience.



As for completely bypassing the pre-filter there are some issues with doing that, but the tank has a screen element in it and the lift pump is a diaphragm that can handle some debris (kinda) and then it goes into the primary filter so there is no concern of damaging the injection pump. I had both the heater and sensor melt to a crisp and do not want to replace parts that will just melt again. For someone that has not had the sensor melt then they could just remove the heater element and use the prefilter. I may do that someday when I can remove both lift pump and prefilter assemble and clean it all and reseal the lift pump.



I am looking for a filter system to go between the lift pump and tank that will not put any additional stress on the lift pump as it has to pull fuel from the tank and through anything in it's path.
 
I've thought about a filter on the suction side also. Thinking that may require an electric assist pump between it and the tank. Not sure.
 
Over 10 years ago I installed a Racor fuel/water separator on the firewall just to the side of the master cylinder. I removed the short hose from the prefilter to the lift pump and ran a fuel line from the prefilter to the Racor, then from the Racor to the lift pump. The Racor is on the suction side of the lift pump. I then rewired the water sensor line and connected it to the Racor filter. The Racor has a clear bowl on the bottom which permits you to gauge how dirty your fuel is or whether it has any water contamination. The Racor also has a drain valve on the bottom. I'm currently using 10 micron filter elements and usually change this filter once a year or whenever the Cummins starts losing power. It is so much easier to change than the stock filter. It also has a priming button on the filter housing which makes re-priming the system a breeze! It may not be the ideal setup, but so far I'm pleased with it.
 
Over 10 years ago I installed a Racor fuel/water separator on the firewall just to the side of the master cylinder. I removed the short hose from the prefilter to the lift pump and ran a fuel line from the prefilter to the Racor, then from the Racor to the lift pump.



I'd love to see a picture of your setup.
 
I would not bypass the prefilter. Took me about 30 minuets to take out the heater and put back together, 1 1/2 seconds to throw in the trash.

Floyd
 
My fuel temp sensor also melted to a crisp.

And yes Joe did a great write and I referenced it when doing the bypass.

#ad
 
Well I am bringing this back from the past as I am finally replacing the lines. Truck has been down for about a month now and all of a sudden I have a friend who wants to give me a free running jeep. Oo. So just want to give a heads up to what I have learned doing this for others down the road...



First just want to say, my last truck, a 2wd '98 had the leak at the 90 degree bend on the fuel module. That truck wouldn't start with a simple leak there, (more on this later) so I just dropped the tank on the cold ground and did it in the driveway. It was easy enough and a draw straw corrected the problem. It was only after doing it I read people saying that lifting the bed was easier. Figured I would try it out this time around since I was replacing lines from tank to lift pump.



Absolutely is easier to lift bed when doing anything like this! Here is a pic of my hillbilly rigging. Sorry the light isn't great.



#ad




Used heavy straps on the four tie down points to the bed and then used a come along with a locking D-ring to lift it off the frame. Doing it this way makes it a one man job and is easy as pie.



#ad




With the bed off, my one leak up by the lift pump soon revealed itself to not be just one leak. I counted 6 leaks from the tank to the pump. In fact the two 90 degree metal lines at the top of the sending unit were almost rusted through. I can't believe this thing ran at all!:eek:



So for access to all the lines, I removed the front driveshaft, starter (remember to have10mm 12pt wrench) and fuel filter. Save yourself time and just remove it all at once if you have a four wheel drive. Trust me on this.



From there it is a relatively straightforward process of removing the lines. The 7/16th line had a hose clamp with a 7mm nut that I was able to view/access from the wheel well, (just above the plunger). And the return line, 3/8th line had a hose clamp with a 6mm nut that I accessed on the back side of the motor from the top. Getting the return line off the metal hose would have been a pain in the butt were it not for a really long pry bar. Using that, I was able to wiggle it off in no time!



That is all there is to it! I am personally using diesel rated rubber fuel line all the way and installation is easy.



While at this stage, if living in any rust prone areas, I would recommend replacing the rear brake line also as it shares clips with the fuel lines.



Finally, I would highly recommend just purchasing a Vulcan Draw Straw as you will need it! I wish I had done that before as now I am waiting on the parts. Otherwise it would have been a simple afternoon job ~ roughly 3 hours.



Hope this helps anyone down the road who may do the same!
 
And yes, those holes in the tailgate are real bullet holes :) One on the left is 12guage and the one on the right is a 20guage... .
 
No I work in a rough area as a firefighter/medic. Tired of seeing the wannabe's with the sticker bullet holes. This tailgate is junk, so... .



It is amazing how different people look at you when they realize you shot your own truck, with a real live gun! :-laf



If I can't have fun in the process, it ain't worth it!
 
If you are concerned about a prefilter then use an inline screen.

Fleetguard FF5079. Put it anywhere in the suction line.



Thousands of Freightliner FL70 series running up and down the road everyday using that exact set-up.

No prefilter/heater assembly was ever used on a 5. 9 in that application.



Seth and I have eliminated the pesky prefilter/heater on both 12 Valves and thrown them in the trash. Ordered the spacer plate from Cummins that goes in behind the pump, ran new lines using the FF5079 and changed over to Draw Straws.



Have the part number for the spacer plate, 3914284.



Done. No more issues. Oo.



Mike. :)
 
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