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#1
10-23-2011, 02:10 PM
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I'm perplexed with my 1980 300SD
Okay so here is my issue....my 1980 (W116) 300SD ran out of diesel. (my fuel sending unit is messed up) I bought some diesel primed the little thing you pump, glowed and it started right up. Drove to work the next day and it wasn't running right like was having a fuel flow issue. I go out to my car at the end of the day and it wont start. It'll crank fine but won't fire. It sounds like it wants to start but needs fuel. I had it towed home replaced all the fuel filters, did the prime thing again but this time when I pump the prime thing it never develops resistance like it should. What's wrong?
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1973 280 - Sold 1980 300SD - Sold 1982 240D - Stolen 1988 300E - Sold 1989 260E - Sold 1989 560SEL 1994 E420 - Sold 1997 E420 2005 CL500 
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#2
10-23-2011, 02:13 PM
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The primer pump is bust?
Have you got any leaks any where?
__________________
1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior  Don't leave that there - I'll take it to bits!
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#3
10-23-2011, 02:15 PM
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No leaks anywhere and the primer pump worked fine the day before so I'm assuming its fine.
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1973 280 - Sold 1980 300SD - Sold 1982 240D - Stolen 1988 300E - Sold 1989 260E - Sold 1989 560SEL 1994 E420 - Sold 1997 E420 2005 CL500
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#4
10-23-2011, 02:16 PM
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If you have a shop vac, put it on blow, plug the tank vent and use the shop vent to pressurize the tank and push the fuel into the system. Disconnect the return line in the engine compartment and see if you can get fuel out with the shop vac pressurizing it.
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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
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#6
10-23-2011, 02:24 PM
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Don't have a shop vac...never had the need for one
__________________
1973 280 - Sold 1980 300SD - Sold 1982 240D - Stolen 1988 300E - Sold 1989 260E - Sold 1989 560SEL 1994 E420 - Sold 1997 E420 2005 CL500
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#7
10-23-2011, 02:26 PM
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If you have enough fuel in the tank - like more than a few cm in the bottom - then you can just swap the return and supply lines and see if it starts.
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1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior Don't leave that there - I'll take it to bits!
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#8
10-24-2011, 09:26 AM
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did you fill the spin on filter before installing? it holds a lot of air, and will take a lot of pumps to fill it with the primer...
also, to speed up the priming, try loosening the out arrow banjo bolt on the filter boss. is there fuel in the primary?
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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 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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