engine help
 

Ok im getting upset with this, heres my problem. 496 with a holley 750 dp. Has fuel all the eay to carb. Filter stays full. Will not start unless you pour gas in the front bowls or starting fluid. Has msd hei set at 36 advanced and no vacuum advance. Its always been kind of a pig to start, but now wont start at all on its own. Suggestions? Engine builder isnt available until monday...
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Re: engine help
 

Do you see any fuel when you pull the throttle? You should be able to see or hear it squirting. Maybe your float valve is stuck closed or the float is full of gas?
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Re: engine help
 

Yes i can see the gas squirt. And this is my first holley so i have no idea on adjustments or how to check anything on it. When they dyno'd it, everything was fine. Basically the only difference from the dyno is i used a mechanical fuel pump(holley aftermarket one) and they used an electric one. It starts fine once its warmed up
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Re: engine help
 

What is your fuel pressure? Anything over 8 psi on a Holley will push fuel past the needle and seat, flooding the engine.

Gary

Re: engine help
 

Im not sure on the fuel pressure. Why would it start by pouring fuel down carb if there was excess pressure? Maybe I'm thinking of that wrong, but seems it still wouldn't start if it was flooding??

Re: engine help
 

Sounds like something has always been amiss and now its just gotten to the point where you're not willing to overlook it.

To me, that means time to check the basics. Fuel pressure, float level, choke adjustment (and if you don't have a choke, you're already done), and so on.

I'm not accusing you of it personally, but I've seen a lot of "I removed all the driveability features of my engine and now its not very driveable".

In my mind everything should cold start perfectly and idle nicely and not overheat, unless you're at least in the 9s.

Re: engine help
 

sounds like your fuel levels in the fuel bowls arent adjusted properly.
there should be two sight screws on the passenger side of the carb. undo the screws and gently rock on the truck. if your fuel level is correct, a little bit of fuel will trickle out.

check to make sure your needle and seats arent stuck open. you might also have to check your accelerator pump arm adjustment.

Re: engine help
 

Choke working??

Re: engine help
 

I will check floats and whatnot. Choke is a manual unit.
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Re: engine help
 

x2

Re: engine help
 

Let us know what you find out

Re: engine help
 

x2!