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#1
03-13-2009, 05:07 PM
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How do you change the fuel lines from injector to injector?
(That WAS an easy job, job now done. Thanks!)
Original post..... I've been smelling some diesel fuel the last few days, and finally found the leak. It's one of the looped rubber fuel lines that goes from injector to injector. How do I change those? Aside from the obvious of pulling them off and putting on new rubber fuel lines, seems as though there's got to be a catch. If I take those off, will fuel go spurting everywhere? Do I need to open my fuel cap to relieve the pressure first? After changing them, do I have to crank and crank and crank due to air in the lines? Gimme a step by step if you can. There has to be more to it than the obvious. And what do you do with the last one, the short one that stands straight up? That one must have to be purchased special, it has sort of like a nail head in it. Thanks, Jeff 1991 300d, 138k Last edited by jbach36; 03-13-2009 at 06:52 PM. 
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#2
03-13-2009, 05:09 PM
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It's the easiest thing to do on the car, just pull them off, they might be wet with fuel but they're return lines to the fuel tank with no adverse affect on the operation of the fuel system.
Just don't remove them with pliers which may crimp or score the metal causing a bad seal.
__________________
1974 240D 3.0L 4(M) - 250K -OM617.910 + 300D FW + Rajay turbo power! 1977 6.9 3(A) - 84k
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#3
03-13-2009, 05:31 PM
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Its as simple as pulling the old one off and pushing the new one on. When the engine is off there won't be much if any fuel in them, and there's no pressure. Its just a return/leftover fuel line. They do not affect starting/running. You could run the car without them and it'd run fine, you'd just lose a lot of fuel on the ground....they are just where the leftover fuel travels back to the tank.
__________________
-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#5
03-13-2009, 06:14 PM
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Quote:
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Jimmy L. '05 Acura TL 6MT  2001 ML430 My Spare Gone: '95 E300 188K "Batmobile" Texas Unfriendly Black '85 300TD 235K "The Wagon" Texas Friendly White '80 240D 154K "China"  Scar engine installed'81 300TD 240K "Smash" '80 240D 230K "The Squash" '81 240D 293K"Scar" Rear ended harder than Elton John
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#6
03-13-2009, 06:22 PM
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The last one is just a length of line with a plug of some sort. I use a rubber vac line plug.
__________________
83 SD 84 CD
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#7
03-13-2009, 06:47 PM
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In theory you could run a real long piece of return line from the 5th injector back to the 1st injector or the fuel filter assembly and use a T-fitting to hook it back into the system.
 I am just causing trouble.
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#9
03-14-2009, 12:59 AM
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Where to find braided return line?
Do regular auto parts stores carry the braided return line, or does it have to be ordered special?
__________________
1982 240D - 292,000 miles and counting Same family for 33 years Newly rebuilt Monark injectors Newly replaced clutch New Bilstein shocks
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#10
03-14-2009, 07:28 AM
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I order the stuff a meter at a time from ***************
__________________
83 SD 84 CD
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#11
03-14-2009, 11:47 AM
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just don't cut too short
I had cut one of the injector to injector lines too short so it made more of an inverted V shape than an inverted U shape. Meaning there was some side pull on the rubber line immediately as it left the metal barb. This seemed to induce a leak at those barbs. With a longer piece, the line left the barb straight up and then did not leak.
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#12
03-14-2009, 12:30 PM
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Are clamps used on the injector hoses?
__________________
83 300TD, 260,000 miles, aka "Dusty" 6 vehicles, 2 cup holders (both in the dump truck)
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#13
03-14-2009, 01:44 PM
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Clamps are not used nor are they required since there is no pressure in the lines. The only caveat that I can think of is that biodiesel melts the braided hose material. It will last about a year (or less) with regular biodiesel use and then will require another replacement. If you use biodiesel regularly, replace these hoses with Viton(R) from Fryerpower or whatever other source you like.
__________________
 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#14
03-14-2009, 06:30 PM
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Quote:
__________________
83 SD 84 CD
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#15
03-14-2009, 06:47 PM
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Quote:
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1987 300TD 309, xxx 2.8.2014 10,000 mile OCI Be careful of the toes you step on today, as they may be connected to the ass you have to kiss tomorrow. anonymous “Be who you are and say what you feel, because those who mind don’t matter, and those who matter won’t mind.” Dr. Seuss
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