Hello,

In replacing my fuel filters today, I noted that the short run between the inline prefilter and the IP was severely degraded. The rest of the line wasnt much better...

So its time to replace. Ive searched but havent seen the exact specs on the line I need... From the hard line to the prefilter and the prefilter to the IP, what is the spec (ID and OD, I suppose) of the fuel line that I need for an 81 240D?

Also, Id like to get the original cloth-covered line. It seems that fastlane has it but it is only sold by the $100 roll. I need 1-2ft.

What is the recommended source for original cloth covered fuel line sold by the foot/meter?

Thanks,

JMH

__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)

MB and Fastlane have the "braided return line" that you want. It is sold by the dealer by the meter.

Using clear viton line from fryerpower.com has some merit as it ought to never need changing again AND you can see through it in the event air is in the lines which is helpful in tracking down the leak.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

I bought Tygon fuel hose from mcmaster.com

__________________

'98 E300 DT
'87 190D 2.5 turbo RIP
'92 S500 Sold
'03 3.2TL-S A-Spec

You could by some fuel line at napa or other local parts store and buy a connector to join them

__________________
1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

I saw looping return line, but no spec for the ID, and it looks like it is for the injector returns...

What is the correct ID/OD for the fuel hose that goes from the hard line to the IP via the prefilter?

I like the idea of the viton lines, but it appears that all the ones sold at fryerpower are the small lines from injector to injector, etc. It appears that those lines have a smaller ID/OD than the fuel line that goes from the tank to the IP via the prefilter. I think that is a 7.5mm ID, but Im not positive, and the lines on mine are so cracked, I wouldnt trust any measurement...

THanks,

JMH

Thanks!

JMH

__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)

I believe that line is 5/16 in inches. Can't recall the mm size.

If the lines in the engine compartment are bad, the lines from the tank are probably bad too. Here's a thread with instructions as to how to empty the tank to replace those lines:

Emptying the fuel tank

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

As suggested by Kerry the hoses by the plastic pre-filter/primary filter can be replaced with regular 5/16 of an inch fuel line that you can get by the foot at most auto parts stores. Thats what I have on my car. If you want another type of hose you could put the regular hose on now and shop around for the hose that you really want till you get a good price and availability on it.
The hard plastic hoses that go to and from the Fuel Injection Pump can be replaced with 1/4 inch fuel hose. However, you need to put clamps on them and be careful how you position the clamps.
The fuel hoses by the tank can also be replaced in the same manner except that the fuel outlet hose up by the tank has a crimped collar around one end. I drained the tank and unscrewed that hose and filed off the metal collar and when the new hose was put on just used a clamp.

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84 300D, 82 Volvo 244Gl Diesel

See a discussion of hose types that will withstand any fuel including biodiesel here. I recently bought some Parker hose from Vulcan Performance. Hose rated for "fuel injection" has an inner lining that is fuel rated, Goodyear is one manufacturer. This is discussed in detail in the referenced thread.

Jeremy

__________________

"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

7.5 mm and 5/16 inch are basically the same i.d. size. If you really gotta have the 7.5 mm stuff, Performance Products sells it by the meter, although I have no idea if it is the original cloth covered hose.

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Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE

On both my 603 and old 617 all the rubber fuel lines were/are 5/16.

I'd get Conti lines from Fastlane or the dealer if you want it to last.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200