R107 280SL 1981 cleaning fuel system

Roger Camilleri

New Member
Dec 13, 2020
Reaction score
Your Mercedes
280SL 1981 M110
I am cleaning the fuel system including refurbishing the pump/accumulator unit, i removed the pipes from the K Jetronic and pump unit so the supply pipe was open from both sides and the return was open from engine side but was still connected to the fuel tank. My Question i blew air through the supply pipe from the engine side and no problem air was passing freely but when i tried to blow air from the return pipe engine side to tank this was not possible, is this normal or do i have a blockage ?


Senior Member
Aug 2, 2006
Reaction score
Your Mercedes
A160 W168 1999 1.6
I need a reminder of where the fuel pressure regulator is on the k-jet system.

Just remembered another thing. On my VW there was a tiny filter, sort of an inline thing as in a washing machine, in one of the pipes on the fuel distributor.

WE HAVE NOW MOVED: 8 Hazel Road, Woolston, SO19 7GB
Service, Repairs and remapping service
Any queries, please do not hesitate to contactEmail@mbsofsouthampton.co.ukor alternatively you can phone Colin or Dave on 02380 445820, out of hours numbers are 07787913313 or 07907631681.
Top Bottom