Electric fuel pumps for carb engined

D

ddurand

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Jun 20, 2001
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5015
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Are people replacing mechanical fuel pumps on Merc 5.7l carb engines because of E10 gas?
 
Forgot the exact numbers but you only want about 4 PSI. All your'e doing is filling the float bowl. Too much pressure, like from an electric fuel pump, can over come the needle(shut-off) valve.
 
I have a 1999 Mercruiser 5.7 with a carb and electric fuel pump. So I doubt there is a pressure problem (there are probably numerous pumps available with diff pressures too). I would not replace it just to replace it though because you'd also have to buy the bracket and replace the line to the carb too. Too much work for too little in return.
 
Are you asking if E10 is causing mechanical fuel pumps to fail?
 
Hmmmm, I'd be curious if anyone is having problems concerning mechanical fuel pumps and E10. I have a 1970 400ci block with a fuel pump that's probably 20+ Y/O.
 
Hmmmm, I'd be curious if anyone is having problems concerning mechanical fuel pumps and E10. I have a 1970 400ci block with a fuel pump that's probably 20+ Y/O.

I know I had a problem that both 1980 Crusader 220 had mechanical fuel pumps that I didn’t know were leaking and went to electric fuel pumps and are very happy with them. One of the problems I had was the quadrajet carburetors would leak down if away from the boat for a week. I needed to crank and crank on the starter to prime the carburetors. Now I just hit a momentary bypass bottom for a few seconds to prime without cranking. Wait a few seconds and they start right up. Less wear and tear on the starter.
 
I have the electric fuel pump but would like to have some kind of "sealed in epoxy" switch that handles the power to the pump before engine is running and shuts power should engine stall. Not looking to add more things to engine that can fail.
 
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