Will a bad accelarator pump cause surging.


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Quick Cal
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Will a bad accelarator pump cause surging.

Post by Quick Cal »



This is on my 89 1500. It has the dreaded surging at idle. I have not pulled the top of the carbs off yet. I plan on looking for bad vacuum lines and see what's what.

So I think I have a bad accelerator pump. I'm not getting any fuel out of the tubes. Can you guys confirm the pump is not working correct. And could this cause my surging? Thanks



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Re: Will a bad accelarator pump cause surging.

Post by Rambozo »

Bad accelerator pump would not cause surging, just a stumble under load with quick throttle opening.
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Re: Will a bad accelarator pump cause surging.

Post by WingAdmin »

You might need to open the throttle a bit quicker - but here's a video from our own Virgilmobile that shows what it should look like:



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It might be wise to try it without the engine running, you can get a better visualization:



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Sometimes if fuel has congealed in the nozzles, they can be opened up by heating the nozzles with a soldering iron then actuating the pump.

That said, as mentioned, lack of an accelerator pump won't cause surging, it will cause stumbling off the line.
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Re: Will a bad accelarator pump cause surging.

Post by ct1500 »

And I might add the accelerator pump is temperature compensating providing a full shot below 50 degrees and somewhat less above that temp.
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Quick Cal
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Re: Will a bad accelarator pump cause surging.

Post by Quick Cal »

I took the air filter housing off. I did not remove the top plate? of the carbs. I couldn't see any obvious bad vacuum lines. I saw some 90* lines. I've read these could be bad. Are the ones usually talked about visible with out removing the carbs?

I did manually manipulate the accelerator pump and got it working. Not sure if it's 100% though. I did find that the metal tube going from the accelerator pump to the top plate of the carbs is leaking. I'm sure the o-rings are bad. Could that be my surge? Just hoping,,,lol. I'm just dreading pulling these carbs just yet. Maybe over the winter.

I talk about it here. All ready posted this video in another thread.



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