GAS QUALITY

[MBZ86]

My 1986 420 SEL 190,000 miles has been sitting for over a year. I keep it as a spare car in case my other car breaks down or needs repair. The last time I put gas in it was about a year and a half ago. I tried starting it the other day and had no luck. Just to make sure there was gas in it I poured about three gallons of fresh gas in it. Still no start.

Here is what I have done so far: some fresh gas, listened to see if fuel pumps are working(yes), shot starting fluid down throat of intake and it started right up but only for a second or two. I did this two or three times and it started every time.

I am assuming that this test would basically eliminate a major electrical problem? I also cracked the gas line from the fuel distributor to the cold start valve and there was fuel. I did not take it off but a small amount came spewing out and then I tightened it back down.

My questions are these: Could the gas have turned so ransit that it is no longer ignitable? Could the fuel system be clogged from setting so long without use? If so, should I start under the hood (injectors,fuel lines etc) and work toward the gas tank or start at the gas tank and work forward toward the engine? Should I drain the tank and put new gas in it?

The car has always started even after setting for some time but this time it doesn't even give a hint that it wants to start w/o starter fluid.

Even though I have owned the car for about 15 years I am still pretty much a rookie when it comes to MB's. If this was my 57 chevy I would'nt need to ask so many questions.

I know that you all have the answers because I have been reading lots of the threads.

Thanks Any help appriciated