BenzWorld Junior Member
Date registered: Sep 2009
Vehicle: 72 280 se 4.5 and a bunch of other german cars
Location: Pgh, Pa
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funny you posted this as I made my maiden voyage w/ a car that has been sitting since 1990 today.
To get it running i had to drop the tank, drain it completely and wipe it out to get any dirt/varnish. The gas in the tank looked like a mix of oil in water and jello. I unhooked the fuel lines in the engine bay and blew them out from fuel tank forward and back. I also changed the fuel filter.
Filled it up w/ a can of seafom and new tank of gas-- it sputtered a little until the fuel distributor (mechanical fuel injection) cleared up. took about 10 miles of driving before it was "normal". I was nervous as hell on the fuel distributor-- as they are not cheap for the old cis cars and the car in question is not common/readily available.
Being you car is a carb and driven in the last 5 years--it should not be that bad. When it was last run 5 years ago wa sit ok then? If so, i would be willing to bet it is w/ the gas. It is possible the gas could have "jelled" inside the carb itself or even a spec of dirt in a needle. My project car last summer was a 70's mg. I have a 30/32 weber on it that this happened to. The needle was gunked up,and the float had what looked like a toilet bowl ring when i ripped it apart and the float itself didnt want to go the full travel because it was varnished up on the hinge. Also, while tearing it down, it just smelled awful. I just carb cleaned/blew everything out and reassembled. Car ran great afterward where i could just hit the pedal one time and it fired w/ no choke! Never in my life had i been that lucky w/ a carb.
But 5 year old gas-- i'd stick it in your lawnmower or use it for your burn pile. As it lost its octane by now. Another easy way to check, setup a 2nd gas tank in the engine bay--- like a gallon of gas-- and hook it to your carb and see how it does. Basically bypass the oem tank, and feed the engine from a second tank.