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Fuel pre pump, Main pump or both 900 1993

posted by  rjk on  Sat Apr 30 00:57 CST 2005
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last visit: Sat Dec 12 12:30 CST 2009
[RELATED]

There is always the possibility the pre-pump is fine and it is just the pre-pump hose that is leaking. Typical of 240's but also possible in 700/900's (I think age is the determining factor and the 700/900 models are now hitting the time mark for this to be a more common problem), the short rubber hose that is used to mate the pre-pump outlet to the fuel sender will develop a leak. Typical symptom is starving for gas when the tank gets to less than 1/2 full. Actually, all the symptoms attributable to a bad pre-pump would be true for the bad hose, the bigger the hole, the more pronounced.

I have never had a pre-pump fail in my fleet going back to the '84 models. My "pre-pump failures" have always been traced to the in-tank pre-pump hose ($4.00 at FCP Groton). Easy repair, replace the pick-up sock and fuel sender gasket while you are at it.

Bob K

'94 945T (daughter co-opted it for college, used to be mine)
'99 S80 (mom-in-law's)
'88 240DL (son's)
'84 242Ti (for sale)
'89 560SL (wifemobile)
'88 300TE (my commuter)
'68 GT500KR (future commuter/under restoration)






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