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Okay, pretty confused. Finished my 455 and put it in. Engine started up fine, ran it for a few minutes to break it in, but shut it off after several minutes to fix some small water leaks. Over the next couple of days got the leaks fixed, starting the engine several times to check they were fixed.

Went out to start it and finish up break in time and adjust idle and carb and it just won't start. Turns over fine, just won't run.

Pour a little gas in the top, cranks right up and goes a few seconds until it runs out of gas.

Brand new fuel pump, clear fuel filter up by the rail going into the carb, fuel pressure gauge at carb shows 5-6 lbs, brand new 93 octane gas.

The thing ran and all of a sudden it seems it's not getting fuel, but all indicators are that it is.

Any suggestions or wisdom to share?
 

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"...it seems it's not getting fuel, but all indicators are that it is. Any suggestions or wisdom to share?...?

If it runs when you pour gas into the carb, but don't, when you don't, then the flow of gas is obviously stopping, at some point. All you need to do is find out where and why it stops.

(1) Unhook the line from the carb. Stick it down into a catch can of some sort and turn the engine over. If gas shoots out into the can, you know it's getting that far. If not, find out why.

(2) The next choke point is the inlet filter, if your carb has one.

(3) The next stop is the needle & seat. If gas can not pass the needle, then the fuel bowl will not fill, so obviously can't supply fuel to the engine.

The problem will usually reveal itself during one of these 3 steps. :yes
 

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BillyMagg
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306 Posts
Okay, pretty confused. Finished my 455 and put it in. Engine started up fine, ran it for a few minutes to break it in, but shut it off after several minutes to fix some small water leaks. Over the next couple of days got the leaks fixed, starting the engine several times to check they were fixed.

Went out to start it and finish up break in time and adjust idle and carb and it just won't start. Turns over fine, just won't run.

Pour a little gas in the top, cranks right up and goes a few seconds until it runs out of gas.

Brand new fuel pump, clear fuel filter up by the rail going into the carb, fuel pressure gauge at carb shows 5-6 lbs, brand new 93 octane gas.

The thing ran and all of a sudden it seems it's not getting fuel, but all indicators are that it is.

Any suggestions or wisdom to share?
Disconnect your fuel line at the carb, run the line into a catch can, and have someone crank the engine over, if you do not have a robust fuel flow, then work from there, if you do have sufficient fuel flow into the catch can then pull the carb or at least accelerator pump and make sure they function properly. The carb fuel bowl should be full, maybe a bad float??

Seeing that the fuel pressure gauge is showing 5-6lbs it is likely a float issue, remove top of carb, and check the float and accelerator pump.
 
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