S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

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Old Jul 15, 2009 | 12:43 PM
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jmwathen's Avatar
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300sdl
300 sdl

what might cause a diesel 300 sdl not too run? it does crank but will not start & run. I understand that there will be a long list.
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Old Jul 15, 2009 | 07:47 PM
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From: MA
1987 SDL; 2001 Chevy 2500HD CC, 8.1L, Allison special order; 1970 GTO LS2, 4L60E, under construction
Start with the fuel supply.
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Old Nov 2, 2009 | 10:36 AM
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1987 300 SDL
Sound silly but put her nose down (like on an incline). If it runs when fogged is the diesel injection pump. Try foging some WD-40 through the air filter canister while somebody cranks her, it should start in a few seconds. No need to get a new pump, just replace all the o-rings. It is a half a day affair and about $400 at your MB shop. If you visually inspect the pump on the lower front part of the block (driver side) you should see some fuel sipping through. The area would be wet with diesel fuel. Let me know if I can be of any more help. G.L.

Last edited by Berde; Nov 2, 2009 at 11:34 AM.
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