Injector pump

[rjfurlan]

I reciently bought a 1967 250sl that had been sitting about 8years.
I cleaned out the fuel tank, fuel lines and added new fuel pump.
It started and ran fine. The next day it would not start.
I cracked open the lines leaving the injector pump and got gss from 1 but not two. I think it is stuck.
I took tjeoil cap off and so no oil in the pump, not did I find dipstick for it.
1. Do I just put regular motor oil in and how much?
2. Is there an easy way to check the injector pump.

I searched and read injector pump tour and others posts.

Thanks
Rich

[ja17]

You will have to find the dip stick first of all. Most times you start off by sucking all the oil out of the pump then add fresh engine oil. There is an full level mark on the dip stick. Fill it till the oil reads at the full (upper) mark. Note, the dip stick should be screwed in then removed for the level reading.

Most likely your WRD stuck in the lean position as the engine warmed up. I would check the WRD first, then the rack in the IP then check the fuel delivery system for clog if the first two items are ok (fuel pressure and volume). Get back with  us if you need more details.

[Benz Dr.]

I agree with Joe. You have the correct IP so it will have a dip stick on it.

[rjfurlan]

Thanks Ja17 and Benz Dr. I found the dipstick and the oil level was ok. I went throught the starting aid tour again and checked all the electrical parts and everything seems to be working correctly. When cranking I think I can feel air being sucked in through the filter on the WRD. I am not sure how to check if it stuck in the lean position. Should I take the WRD off and clean it and if so do I need to drain the coolent? Or should I move on to fuel delivery?

It wants to start, it will run for about a second. I am fairly sure it is a fuel starvation problem.
I will chech the flow rate and double check the return line in the tank. Another possibility is the fuel pump. It is not the correct pump. I can not see any writting on it but it is a small cylindrical shape, like a newer style fuel pump, not a W113 pump. Are there aftermarket pumps that are acceptable of should I just bite the bullet and get the correct pump? Any other suggestions?

Thanks

[ctaylor738]

Suggest you do a fuel volume check by unhooking the return line (near left fender), routing it into a container and running the pump for 15 seconds.  You should get a liter of gas in that time.  That will tell you if your pump is supplying enough fuel.

There is a post by stickandrudderman about a cheaper replacement pump, but IMO you should suck it up and buy the correct pump.

Cheers,

CT