Thread: fuel pump groan
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Old 10-23-2003, 08:40 PM
David Speed's Avatar
David Speed David Speed is offline
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Join Date: Aug 2003
Location: Brisbane, Australia
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Similar problem on my recently reborn 1978 280CE.........got worse quite quickly to be nearly as bad as yours

Filter change should be your first step........if that makes no difference it is likely the pump or the supply of fuel to the pump

I suggest you check fuel delivery with a new filter.........mine gave good delivery at first then poor varying delivery when playing up........my problem turned out to be a choked in tank strainer screen............the groan was from sucking against the blocked screen............sitting for a while must have allowed some of the gunk to float away.....but it quickly clogged up again

When draining the tank the flow slowed to a trickle..........a blast of compressed air up the fuel outlet tube started things going again and gave me the diagnosis...........pulled the tank and couldn't believe the crud.........3 coffee mugs ~ 1/2 Kg!!

Clean tank & new in tank strainer and the problem was solved.........I still had to replace the pump as during the process it jammed with gunk that I couldn't clean

Pulling the tank in my case (w123) wasn't as bad as it sounds......the symptom of being ok when sits for a while is what makes me think it is the screen........fuel delivery is the first check.......on mine spec was > 1litre in 30 secs......crack return line fitting on fuel distributor

Link to my problems
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