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  #16 (permalink)  
Old 02-06-2011, 10:32 AM
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72 Chevy Cheyenne
 
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I checked the charcoal canister and everything looks to be in good working order, except the in line filter. It looks to be ten years old. I'll swap it out. I am leaning towards pressure though judging from the amount of gas consumption. This is a stock 360 and is only getting a couple of gallons better MPG than my 72 Chevy with a speed demon carb, vic jr intake, 550 lift cam, 3000 stall, racing gears did. Thanks for the input guys.

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  #17 (permalink)  
Old 02-06-2011, 10:35 AM
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Quote:
Originally Posted by sqzbox
The OP said the PO installed it before he bought it.

Oh so it's been doing this since he got it.



Cole
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  #18 (permalink)  
Old 02-06-2011, 12:35 PM
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Quote:
Originally Posted by DanielC
I think a lot of people are too quick to abandon mechanical pumps.
A mechanical pump pumps more gas as the RPMs go up, a good thing.
A mechanical pump uses the cam motion not to pump gas, but to draw the gas into the pump, under the diaphragm, and it is the spring in the mechanical pump that pushes the gas to the carburettor needle seat. The pressure on the needle, from the float balances against the spring in the mechanical pump, and it all balances out. The spring only delivers gas into the carb when it is actually needed. On a factory system, the fuel pump cannot over-pressurize the needle and seat.
Your fuel level stays where it should be.
I agree with you completely. I went to an electric pump a few months ago and just switched back to mechanical last week. The electric pump is noisy, and i hate having to let it prime before you start the engine. Mech is also more reliable. The electric pump left me stranded in a parking lot so that was enough of that.
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  #19 (permalink)  
Old 02-06-2011, 12:45 PM
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One other thing I noticed after re-reading the thread post #8 is the electric pump being under the drivers seat on the frame rail is not the correct location for it. It should be mounted as close to the fuel tank as possible to PUSH the fuel to the carb, not pull it from the tank. Being mounted under the drivers area must be annoying having to listen to the buzzing all the time.
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