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#1
03-03-2012, 09:54 PM
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99 e300 fuel line question
Hello,
Could someone advise me of which fuel line is the supply and which is the return on a 1999 E300. The lines are located on the diver side near the brake master cylinder. There are two are plastic lines one is larger than the other.
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1982 300d Turbo Diesel (Sat in P/O's Garage for 10 years) Purrs Like a Kitten 1999 E300 Turbo Diesel 1998 SLK 230 
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#2
03-03-2012, 10:46 PM
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They are rubber lines not plastic and the top one is the supply line, bottom one the return line. If you follow the top one it goes to the fuel filter housing. I recently changed mine and I am changing the return one tomorrow.
EDIT: That may not be correct, the dealer told me this info. I remember seeing a diagram with the fuel flow for the 606 on a thread awhile back, I will search for it.
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1999 E300 TD 190,000 1996 Passat TDI 225,000-sold 1996 E300 120,000-sold 1998 Jetta TDI 186,000 -sold 1983 Chev Suburban C20 6.2-sold Last edited by dauber; 03-04-2012 at 12:15 AM.
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#3
03-04-2012, 12:22 AM
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My 97 300D will not start. - no fuel.
This thread had the fuel flow diagram. I was incorrect. The Bottom line near the firewall is the fuel supply line.
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1999 E300 TD 190,000 1996 Passat TDI 225,000-sold 1996 E300 120,000-sold 1998 Jetta TDI 186,000 -sold 1983 Chev Suburban C20 6.2-sold
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#4
03-04-2012, 10:03 AM
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Fuel lines
I am referring to the two plastic lines that come from the fuel tank and terminate on the driver side firewall near the mater cylinder. There they are connected to rubber fuel lines for connection to the engine. One is larger than the other. Which one is the supply and which one is the return?
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1982 300d Turbo Diesel (Sat in P/O's Garage for 10 years) Purrs Like a Kitten 1999 E300 Turbo Diesel 1998 SLK 230
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#5
03-04-2012, 12:24 PM
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Answer:
The bottom one
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1999 E300 TD 190,000 1996 Passat TDI 225,000-sold 1996 E300 120,000-sold 1998 Jetta TDI 186,000 -sold 1983 Chev Suburban C20 6.2-sold
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#6
03-04-2012, 12:47 PM
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The larger 10mm hose is the supply and the smaller 8mm hose is the return.
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E300TD year 2000. RUSTY  SOLDcost a fortune to maintain on the road  but run well on WVO  Second Merc died due to corrosion ( NOT rust) How can mercedes get away with that for so long? Third lasted a month then went away... Fourth now... Corroded too...
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#7
03-04-2012, 12:56 PM
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If you follow the lines you will know your answer, that is why I put the flow diagram up. The bottom goes to the pre-glow heater and then to #1 in the chart.
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1999 E300 TD 190,000 1996 Passat TDI 225,000-sold 1996 E300 120,000-sold 1998 Jetta TDI 186,000 -sold 1983 Chev Suburban C20 6.2-sold
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