On my 4th MAP sensor

[jokershockey29]

the MAP sensor in my 87 Chevy 350 TBI keeps going bad. I have checked for vacuum leaks and everything is fine. Checked the voltage at the sensor and with just the key on it reads about 4.69. Using a vacuum gage the voltage drops about 1 volt for every 5 psi. I installed a clear hose from the TBI to the MAP sensor and I have noticed fuel in the line. Not vapors but actual fuel that is sloshing around. I'm thinking that is not normal and could be causing my sensor to keep going bad. Anyone have any thoughts on this? Thanks.

[cableguy0]

You likely found your problem. there should be no fuel in the vacuum lines period. Im sure the fuel is killing the map sensors. Its not designed to handle the fuel. I would suspect the throttle body is leaking fuel internally allowing it to get into the vacuum circuit.

[STOCKISH]

You just hit the nail right on the head. Time to rebuild that throttle body.

[jokershockey29]

Thanks, thats kind of what i was thinking. But I've already rebuilt it once. I was going to do it again anyway so i was hoping that might fix the problem.