My brother and I bought a non running 1992 190e last weekend. I was able to get it to get it to start, but shut it off to fix a loose belt. Well it wont start now. I drained the tank and fuel system and replaced the gas, New cap, rotor, spark plug wires and spark plugs. i have a spark tester and am getting great spark compared to how it was when it first started. I am getting fuel to the mechanical fuel distributor( cracked the lines while my brother by passed the fuel relay). I noticed that only one of the fuel pumps is making any noise and vibrating. Do these cars need both pumps to run? Also, it will back fire through the intake and exhaust after I crank on it for about 15 seconds. It gets super close to starting, but wont quite go all the way.

I'm really good with the old diesel benz's and the JDM motors, but this guy has alot going on under the hood. Any ideas would be a great help.

Thank you

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