Author Topic: fuel injection pump  (Read 339 times)


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fuel injection pump
« on: December 20, 2019, 19:55:11 »
Hi everyone. I need some help. After a two year restoration on my 1967 230SL and thousands of dollars spent I still have a problem with cold starts and I have been told by two mechanics that its the injector fuel pump which I have had serviced but not rebuilt. Anyone knows where and who does rebuilds or exchange's on injector pumps and should I look at updating the injector pump to a 280sl one as I am told they are a lot better.
Any help will be appreciated

Regards John


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  • Nicosia -CYPRUS
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  • 280SL Auto 1970 W113, 380SL Auto 1982 R107
Re: fuel injection pump
« Reply #1 on: December 20, 2019, 20:51:16 »
Hi John,

With all due respect to your mechanics, I would first look at all the cold start devices like cold start valve, thermo switch etc before going into the FI pump. They rarely go wrong unless somebody has been messing up with it....

Nicolas Aristodemou
Nicosia - CYPRUS
280SL Auto 1970, US spec (W113)
380SL Auto 1982, EU spec (R107)

Benz Dr.

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Re: fuel injection pump
« Reply #2 on: December 20, 2019, 23:21:21 »
You have to stick to a 230SL injection pump. Each engine has its own pump designed to work only with that system. What are your problems right now?
1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
Dan Caron's SL Barn


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Re: fuel injection pump
« Reply #3 on: December 21, 2019, 10:33:45 »
I would have thought if youe are right after restoration, it seems like a natural step to go through the Linkage Tour:

Or specifically engine starting aid (if this is your issue):

That may prevent you from huge expenses and going in the wrong direction.

You need to be a Full Member to access some of those, but I am sure you will soon find this is the best investment in your car that you could make.

280SL 1970 automatic 180G Silver
W128 220SE
W121 190SL


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Re: fuel injection pump
« Reply #4 on: December 21, 2019, 14:43:45 »
After checking all the starting aids, I would hook a temporary switch to the intake CSV. By experimenting with this you can help diagnose the problem.
Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback


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Re: fuel injection pump
« Reply #5 on: January 15, 2020, 00:08:45 »
exactly, next time you think it will struggle to start, bring the fuel pressure up, then hot up the cold start valve for 3-4 seconds and crank. if it starts look at the cold start system