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#1
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606 fuel supply mix up
I've been trying to narrow down the cause of my sluggish 606. I wanted to eliminate a clogged fuel supply as a source so I filled a 2 quart container with fresh diesel and put the supply hose deep in it. I plugged the hard line coming from the tank so I wouldn't get diesel all over the place. I did not put the return line in the 2 quart container. I went for a spin and got about three blocks. Car died. I looked and the fuel supply was empty! Is there really that much fuel sent through the pump that quickly? I'm guessing that I would have been okay if I would have put the return line in the 2 quart container, but I'm not sure. that's a lot of fuel in a few blocks. I wasn't gunning it either.
Finally I switched supply and return hoses where the fuel lines enter the engine compartment and went for a spin. No difference.
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2009 E320 Bluetec 117,000 1995 E300D 306,000 Sold 1996 Ford Taurus LX 130,000 Sold 1985 300TD Still 225,000 Sold 2016 Ford Fusion 24,900 |
#2
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Yeah, the pump moves a lot of fuel through it and only a portion is actually diverted to the engine to burn. I think it's about a half a teaspoon every cycle of the lift pump.
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-Evan Benz Fleet: 1968 UNIMOG 404.114 1998 E300 2008 E63 Non-Benz Fleet: 1992 Aerostar 1993 MR2 2000 F250 |
#3
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That is correct, the return hose is just as critical as the supply hose in a Diesel engine. The returned fuel is used to cool the injector tips and provide lubrication to the pump. If you have ever grabbed a return line on a just shut down engine you will understand, that fuel is quite warm.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech |
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