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520 hesitates / fuel issue?


Droski

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The truck jerks and loses power Like it wants to go but it hesitates then goes. The engine never shuts off. The gas in the carb leaks when pumping the gas peddle I found that out today without having the engine on. 4 pumps and it begins to leak.

That is when it is not running, it likely doesn't leak like that when it is running.

Is the fuel level on the line on the glass, or does it have a line?

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Found an exploded diagram on the web it's identical to mine. It's for a J13 exc. LTU from May 68 to Jun 69. I guess it fits on the 66 all the way up to 72 maybe.

The J13 was only used the 521 US models to the middle of 1969, then it was replaced with the L16.

You likely have a J13 as that is the type of intake manifold you have, I don't know the availability of the J13 Nikki carb rebuild kits.

If you pull the choke on does it hesitate?

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Fuel level is on the line. I gave it 25 pumps and immediately gas started basically pouring out from the throttle shaft and the fuel level decreased dramitically enough to give the truck a rough start like it had just ran out of gas (same symptoms as when it's running and chokes up when I'm hitting the throttle). Either way I need to be able to pump my gas pedal without losing any gas through the throttle shaft. This also explains why I have been getting shitty gas mileage lately!

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Man those are cool maybe when the budget allows it. What do you have going on there if you don't mind me asking?

I like the bottom setup

 

On another note the truck diesels pretty often after shutting it off especially if I've been heavy on the pedal. It's always done this. Is it something to worry about. It almost seems like it just burning a little left over fuel. The dieseling doesn't last long at all.

 

It's not good to let it diesel, you should put it in gear and let out the clutch as you turn off the key.

That is MGB stuff, basically the same engine as the J13.

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The truck jerks and loses power Like it wants to go but it hesitates then goes. The engine never shuts off. The gas in the carb leaks when pumping the gas peddle I found that out today without having the engine on. 4 pumps and it begins to leak.

 

Have you replaced the fuel filter?

 

 When you pump the gas the accelerator pump squirts raw gas into the primary barrel. (or should) this gas will wet the throttle plate and if the throttle shaft is worn it might wet the outside as shown.

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