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#31
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#32
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I don't think there's an air leak between the lift pump and the tank because the primer pump works.
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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 |
#33
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will still suck fuel, plus some air.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#34
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are you certain that the IP does not draw fuel ever?
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#35
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Wouldn't the lift pump do the same thing but it's not delivering fuel to the secondary filter at all.
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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 |
#36
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The inline Bosch pumps (with external lift pump) does not draw fuel by itself, ever- it cannot. The VE Bosch pumps (like on your Jetta) have built in transfer pumps (vane type) and they do draw fuel. You can run a test on your inline IP.... bypass the lift pump and see if the engine will run. I bet money it will not.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#37
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The best tool for quickly diagnosing if there is air in fuel is a clear section of fuel line at the cigar hose. It should be solid stream of fuel there. If air is getting in, it will end of there and be easily seen.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#38
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I almost bet the lift pump has so much wvo crud in it that it has ceased functioning. Or only functioning at a very small amount of the requirement.
Take the output line off and crank the engine. In a way you have already accomplished that with no results. If the replacement or cleaned tank filter has not crudded up again. And I doubt that as the primer pump might not move fuel if that where the case. |
#39
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Just to update some of the recent conversations, I checked all of the lines and connections, I can not find a leak. Now that being said, it doesn't mean I could not have missed something somewhere. There's alot of dark areas bends etc, but the fuel lines, etc. all look good. Rust is not a real issue on this car, even though it is a 40 year old car the undercarriage and lines, etc. are very clean, but I gave it the once over and feel it is not the case. But, I have been wrong before.
I went to the local MB dealership and ordered the rebuild kit for the lift pump and a new primer pump. The primer pump as a precaution while I have it out, it does stick a bit when I push it down. My plan is to tackle the lift pump this weekend. I think at this point, it is wise to do anyway, because of the comment by Barry and others have made, referring to the amount crud that has gone through the system. There is a good possibility that there is an air leak, but also a greater possibility that the lift pump needs to be refurbished regardless. Also, I will diagnose the air in the system as Funola suggested by inserting the plastic run of fuel line on the return end. Also, I did not remove the output line, but as you (Barry) stated it would not have pumped when primed and it did with ease. I will keep everyone updated and I again appreciate the help and suggestions of everyone. |
#40
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I wouldn't rebuild the lift pump, I would toss it and buy one that was only used with diesel. I tossed two I had because the veggie gunk destroyed them.....chances are, the lift pump has a broken spring in it......there are also two different lift pumps thus two different kits.....you should have the early style on that car....
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#41
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I checked Ebay with no success. The dealership was pretty good about ensuring we got the correct one, we'll see. Thanks |
#42
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You can always ask in the wanted section but here is one used one on eBay...
Mercedes 617 300D 300SD 300 SD 240 D Diesel Fuel Injection Prime Side Pump '83 | eBay
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#43
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I'll do the wanted angle, thanks and I'll let everyone know how I made out. |
#44
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Since you have the early style, when you changed to the newer black primer pump.....did you reinstall the valve? Number 62 and 63? With out that, it will not work.. http://www.peachparts.com/shopforum/diesel-discussion/322286-78-240d-lift-pump-valves.html
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Last edited by cooljjay; 10-11-2013 at 05:50 PM. |
#45
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Thanks again, I'll look into it, but for now I am removing and putting the current lift pump back together.
Here are some photos of the removed parts and I would imagine if this was not the problem it definitely contributed. |
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