Thread: 1980 350sl
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Old 11-14-2003, 04:32 PM
maheath maheath is offline
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Join Date: Sep 2001
Location: Austin, TX
Posts: 563
There was a "euro" 350SL in 1980. It's a Continuous Injection System (CIS), i.e. mechanical. K-jetronic fuel injection. The engine is the M116.984. The 3.5L M116 engine with K-Jetronic fuel injection was never sold in a U.S. model Mercedes. That basically means that getting accurate information on it here in the U.S. will be like pulling teeth. In fact, the last 3.5L M116 sold in a U.S. model was in the 1971 280SE 3.5 and 300SEL 3.5. I'm not even sure if those were fuel injected or not. I don't think they were.

If you need to fool with the fuel injection at all, I would recommend the book Bosch Fuel Injection and Engine Management, by Charles Probst. You can find it on for about $21 new.

If it's been sitting for four years, you will need to go completely through the fuel delivery and injection system. Whatever gas is currently in it, get rid of it. You may even want to get the tank professionally cleaned. Start at the tank and go forward. Check the hoses for cracks, see if the fuel pump is getting power, replace the fuel filter, etc. The book has an excellent troubleshooting section. You'll need a CIS-specific fuel pressure gauge. There are a few out there, I got mine at J.C. Whitney.

Based on your description, my guess would be the fuel pump or the fuel distributor. Pray to God it's the pump. The cost of a new fuel distributor would be about as much as you paid for the car. And it's not like there's a bunch of used ones laying around. If it comes to that, look for a 1976-1980 350SL, 350SE, or 350SEL. All are euro models.

I don't mean this to sound condescending, but how do you pay $2000 for a car that you know nothing about, haven't seen, and didn't do any homework on?
Mike Heath
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino
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