Quote:
Originally Posted by funola
I took the fuel sender out so I can vacuum out the 2 gallons of fuel to replace the leaky hose at the bottom of the tank. I checked the sender and found the reserve light contacts not working (I had cleaned the sender last summer and it was working then). Upon disassembly I found the contacts gummed up with the same black algae crap. Maybe this crap is keeping the ball from seating? Or maybe I didn't pump enough? Anyway I'm gonna pump more first and listen with a long screw driver as a stethosscope and see if I hear anything. If that don't work then I'll close the banjo.
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The noise you are listening for is vaguely like a grinding noise. When you pump the hand pump it slowly pushes the air out of the system and makes no noticeable or characteristic noise. Then, when the injection pump, filter, and all the lines are more or less "solid" the check valve chatters as you continue to pump. I usually pump it for a significant time, like another 50 strokes, when it is making the noise as the air on the injection pump/high pressure side of the system is pretty difficult to drag out of the high sides of loops. There just isn't that kind of flow velocity in all the parallel paths. I have no experience with the "new" hand pumps. But with the old ones there was no real penalty from pumping longer. Other than the skin on your fingers being rubbed off if you don't use a cloth to protect your skin.
The new ones don't have the hand pump at all. I just replaced the filters in my 1999 E300D TurboDiesel. You prime the system by cranking the engine. Even after filling the filter with fuel before putting it in, this still took several 30 second cranking sessions to get the engine to fire.
Good luck. Jim
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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles
Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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