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Old 05-03-2005, 06:58 PM
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Fuel filter

I cant get the air out of my fuel filter on a 1983 300sd. I keep pumping with the hand pump, but I can see a big air bubble in the filter. What should I do??
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Old 05-03-2005, 07:43 PM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 33,020

call in lawrence welk! well im showing my age. seriously, the prime pump may be shot. if that is the case you can get going by removing your air filter top and spraying wd40 into the intake while cranking. the car will run on it. keep spraying until it will run on its own. then think about changine the prime pump. are you sure youre using it correctly? if not sure see owners manual.

good luck
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. It still needs upholstery redone...I also have a 427 Cobra replica with an aluminum chassis.
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Old 05-03-2005, 08:26 PM
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Location: Sonoma County, California
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Fuel filter

Originally Posted by 83_300Sd
I cant get the air out of my fuel filter on a 1983 300sd. I keep pumping with the hand pump, but I can see a big air bubble in the filter. What should I do??
I have an 83sd also and I find that the primming pump works best if I unscrew the plunger enough to get it to move easily then retighten it until I get some resistence and then I still have to pump a lot. I just ordered a new style pump just for that reason.
1983 300SD
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Old 05-03-2005, 08:30 PM
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peace out
Join Date: May 2004
Location: California central coast
Posts: 1,004
If the bubble you refer to is in the plastic pre-filter just prior to the lift pump, then you are looking at normal operation. There is always a bubble there.
Think Alternative Energy!
300CD '80 (now gone but not forgotten...)
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Old 05-03-2005, 10:41 PM
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Join Date: Mar 2005
Posts: 23
Yea, its in the plastic pre filter, didn't know that, thanks..
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