Question is does GM still offer the fuel supply line for a (1994 GMC seirra 2500 6.5 non turbo) coming from the tank? What abouth the return line going back to the tank? Or will I have to make a new pair out of tubing. Problem is I have replaced the IP,FSD,filter,lift pump,because of a start and stall condition leading to no start at all eventually. It ran awesome for about six months and now I have a stutter at higher RPM's and when pulling a trailer there is more load on the engine and it is more noticable @ lower RPM's. Iam dropping the tank today because I have a suspition that the sock is crudded up. Also its been a michigan truck all its life with the salt its rusted the line quite well and to add to that its previous owner lived on a dirt road. While dropping the tank thought that lines might be a great idea to rule out any air now or in the future. Any help would be appreciated.Thanks and God Bless

Sorry folks I was in such a hurry that I never introduced myself. My name is Jim and live in Michigan,part of the rust belt lol. I own a 1994 GMC 2500 2wd 6.5 NON turbo I found this awesome site and have been reading forums for a while and thought I would join. Forgive me for the quick question without a proper entrance.

Make sure you change the sending unit comming out of the tank too if you go that route. My lines from the tank to the LP are all rubber now. Haven't had a problem since.

What did you do at the sending unit for fittings?? Did you cut off the bump tube o-ring fittings that come on the two lines coming out of the new sending unit and use compression or ferrule fittings on each line then use compression or ferrule fittings at the lift pump and where you connect back into the return line? Just replacing the main run along the frame with rubber?

Just cut the lines on both sending unit, and into the LP, smoothed out the cuts, slid the hose over them, and put a hose clamp over it. Did both supply and return.

I figured with no barbs on the lines that there may be a issue with a small air leak. Just me thinking because I have a few years of machine plumbing and industrial sales and service behind me. I also like to do things once and with these beast it seem people do things MANY times.

Mine has been that way over a year with no problems at all. And I don't foresee any unless the tubing under the rubber line at the ends rots out and colapses.

Thanks for the help I appreciate it !! Great site here with quick and knowledgeable help. Off to the tank drop :( AHH the smell of diesel fuel on a hot summers day.

One last thing, if you have a flare kit, and want the added security, you could flare the tubing before sliding the rubber hose over them, then clamp it beyond the flare.

Most of the lines are still available from GM, especially if they have a section of coupled hose. If you post or PM your VIN, I can tell you which part numbers you need and current pricing.

This site might be cheaper than GM, just go here (http://www.lmctruck.com/)!

Well I ordered a new sending unit/fuel pick-up at NAPA for only 80.00 bucks.The tank is like brand new inside and the baffle assembly was tight and sturdy,little to no sediment in the bottom to speak of either.Very happy about that !! I took a small Parker tubing cutter and cut on either side of the lift pump to save the bumptube o-ring fitting to use for barbs for the 3/8 rubber fuel line. I evenly cut both return and supply rubber line near the bellhousing and installed a 3/8 double barb fitting in the supply and a 5/16 double barb fitting in the return. I then run my 3/8 hose to the lift pump, clamped it then ran it back to the tank. I then ran my 5/16 hose from the return by the bellhousing,clamped it and ran it back to the tank.I left enough spare hose to drop the tank easily without stretching the hose to much. I eliminated all the old rusty line except for the small amount that runs up from the bellhousing to the filter assembly. I dont believe that small run of tubing is that weathered to really replace. It looks like it still has its original corrosion resistant coating on it. I will know more tomorrow when I pick up the sending unit/pick-up assembly. With all the rusty fuel line gone I believe I have the problem licked (knock on wood) I will post more tomorrow on the outcome of the project.

Please make sure you guys are getting rubber hose that is rated for diesel fuel.

I got Authentic Goodyear brand fuel hose. I hear you on the fuel hose thing,I used to sell Weatherhead and Parker brand hose and fitiings and seen the backyard mechanics that brought me in a 1/4 id hose that was swelled shut and the od looked similar to a 1/2 hose it was so swelled. I seen alot of crazy stuff in that industry. Thanks for the advice I appreciate it.

you mean the standard "fuel" line isnt addequate?? the ones that are available at any parts store?

wtf...i thought thats why it said fuel and not gasoline line.

All the major hose companies make a rubber hose good for general purpose but should never be used for fuel applications. It has a EPDM inner tube which can swell over time. Many people think that this can be used for a fuel application. Then they make a "fuel" or petroleum application hose with a Nitrile inner tube which is used for fuel and will not swell with petroleum products or fluids. All rubber hoses are not created equal.

ya ive had windsheild washer line i tried as return hose before...not good.

so the fuel line they sell is ok.....its the braided one with the cords in it....

I have a full set of OEM lines from a 2000 regular cab truck I parted out. The rubber hoses were cut about one foot down from the fuel filter manager though. Cherry rust free parts so. cal . Send a PM if you're interested.

i used brake line and compression fittings on mine

Truck is FIXED !!!!!! It accelerates like it was new,well almost new. As good as it can since it doesnt have a turbo. No hesitation,no cutting out at high RPM's,pulls through the RPM's great.The air leak is gone with the new sending unit and brand new rubber lines. I cant believe that GM rarely checks this issue and goes on to replace everything but. The days of diesel cologne are gone for now until the next issue. For anyone with this sort of issue make sure you check and recheck the supply and return and the fuel pick-up/sending unit. Cheap fix in my opinion. It like sucking through a broken straw, alot of burping and to much air.