Lifetime Premium Member
Date registered: Oct 2002
Vehicle: 1967 250 SL, 1963 220Sb
Location: Los Angeles / Altadena
Mentioned: 3 Post(s)
Quoted: 102 Post(s)
I _really_ recommend you watch some of the videos in post 6. A good cleaner for fuel lines is DIESEL and lots of fuel pumps will crap out if you pump diesel through them. What I did was approach certain things from back to front, some things independently. The tank was independent. For the fuel lines I disconnected the metal pipes from the rubber hose in front. The forward line goes to the fuel filter (a big aluminum thing that looks like the oil filter) and the return fuel line comes either from a pressure regulator or from the injection pump. There are only two metal lines running the path from front to back so you can't miss them under the driver's side of the car. So hook a rubber hose from the forward line under the hood to the return line under the hood. Then hook a pump to the rear of the car to the forward line and run the return line into a collection container. Then pump diesel through it. Do this for a while. If it's coming out clean you can recirculate the diesel (meaning have the pump suck from the collection container and the return dump into the collection container.
After you do that you can clean the fuel filter housing (replace rubber gasket and have a new fuel filter. On my car the fuel filter has gas coming in from forward line and connects with a compression fitting to a pipe that a) feeds injection pump and b) feeds CSV. I didn't want to pump stuff to the CSV and have it squirt if cranking so I disconnected the wire at the CSF. At this point you can pump through the injection pump (which is between the fuel filter and the pressure return fitting. At this point I pumped a mixture of 80% carb cleaner and 20% ATV (as a lubricant) without cranking the pump. Do that until it comes out clean.
It really depends on how well you want to do this. I went to the junkyard and cut 7 fittings off of a diesel car so I would have some injection line stubs and I disconnected the injection lines from the injection pump and connected the stubs with plastic bags over them. With cleaner circulating through the injection pump you can crank the engine (this is why I disconnected the CSV - also disconnect the coil wire) and you should see a little spurt of cleaner come out of each of the stubs. See the three attached pics. If it looks crappy when you crank the engine, do it some more. When it looks like what is going in is coming out, that part is done. If you DON'T get fluid out of all 6 pipes then you have a different problem that we can discuss if it happens.
I cleaned the injection lines themselves using carb cleaner with a rubber hose on one end, and then filling the hose with some carb cleaner and blasting it out the other end with compressed air. Be careful that the output isn't pointing in your face - it will really shoot.
Then I cleaned the injectors with a pop tester (which if you watch the videos you will understand). I cleaned the CSV and replaced the TWO rubber rings and put it all back together. Then I flushed it with gasoline and cranked the engine and got all the cleaner out of everything until gas came out of the injection lines at the injectors prior to tightening them at the injectors.
The LAST thing I did was to actually connect the gas tank to the CORRECT fuel pump and get gasoline circulating through all the proper passageways (with a fuel filter element in the canister now).
The engine in the picture is an M189, not an M130, but for your purposes the process is the same. Return line might be in a slightly different place.
Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...