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Chevy 57 L Tune Up

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jandring

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"To start I am a novice whow w

"To start I am a novice whow wants to learn so pardon my inexperience, but generally a quick learn. I replaced my 5.7 L Chevy motor last year (after a poor winterization and cracked block, literally oil/water coming out of the carb) with a rebuilt Chevy 5.7 L. Everything went together great, now just down to fine tunning. Have had it out and runs ok, but idles high (around 1000 rpm) and when I put down the hammer, it seams like the engine is starving for fuel. I had put on an electric fuel pump (a generic cheap something I had) when I replaced the motor, but my suspicions are it probably is not large enough. Also trying to get the idle down around 800 rpm (at least that's what I have been told). Maybe timing is also off. Reused the carb from previous motor (rebuild carb?) Any advice would be appreciated. Thanks"
 
"just a few questions..

Fi

"just a few questions..

First if it's not a marine electric fuel pump your not protected electrially from Fire. Same with the Altenator and Starter.

Sounds like the carb needs to be rebuilt, if it's hesitating that typically means the accellerator pump circuit isn't working properly, do you know when the pump was last cleaned and rebuilt? Have you checked the fuel ? is it all fresh?

What type of ignition system are you using? Mercruiser Electronics usually need to be put in BASE mode to set properly. Also a high idle can be a vacuum leak (on the carb, base of carb or intake manifold) Lastly are you setting the idle in the water in gear with the engine warm? with the throttle cable connected?"
 
"Thanks for the response.

I

"Thanks for the response.

I believe it is a marine fuel pump, but I need to double check. In any case, it maybe undersized and I am planning to replace. I need to find out what pressure and capacity I really need before getting one. The Altenator and Starter are marine as I reused from the old motor since they worked fine.

The carb was rebuilt 7 years ago. When I replaced the engine, I did an intesive cleaning, but did not rebuild. Fuel is fresh. I pulled the tank and cleaned it this spring, before taking out.

Not sure on the ignition system. If my memory serves me correct, it is a Mercruiser product, but would have to check. I have been seting the idle in the water, but not warm nor in gear.

Thanks"
 
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