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1986 chevy k10 pickup fuel problem *urgent*


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chummins2500
New User

Aug 6, 2014, 3:38 AM

Post #1 of 6 (2317 views)
1986 chevy k10 pickup fuel problem *urgent* Sign In

1986 Chevy k10 fuel problem *urgent*
I have a 1986 Chevy k10 pick-up with a carberated 350. My problem is that I ran out of gas, which uses a mechanical pushrod fuel pump. I filled it up with gas and no pressure was reaching the carb. So i assumed it was bad pump after. So I took it off and noticed it was indeed bad. Then I replaced it with a New pump. After I put it back together and mad sure there was about 5gals of fuel I tried to start and all it did was crank, no fuel. I checked and started (repeating this multiple times) and yet there was still no gas making its way towards the carb. I have no idea what to do next.


Tom Greenleaf
Ultimate Carjunky / Moderator
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Aug 6, 2014, 3:53 AM

Post #2 of 6 (2312 views)
Re: 1986 chevy k10 pickup fuel problem *urgent* Sign In

? Might be sucking air thru leak in line to tank if high enough might not leak fuel readily there also.


Hard to install wrong with falling pushrod it wouldn't go or none did for me. If using tiny filter at carb it's so small it could be clogged solid. Cheap part but watch out for almost invisible clear plastic seal 1/4 dollar size ring that is the seal to carb body or might be metal with a rubber coating? Has to have that and do NOT use Teflon tape anywhere.


IDK but needle valve may have stuck shut not letting in fuel. Careful and use right tools on those flare nuts holding 1" filter housing first and see if fuel gets that far now maybe as the easiest check.


Other would be test with a temp line at pump inlet to a small gas can to see if that works. It's old so all caution not to break or strip anything for any testing,


T


(on edit) Another maybe is it's so dry now it might want more engine speed. Try priming carb and engine should run for a few seconds at least and may snap it into working?



(This post was edited by Tom Greenleaf on Aug 6, 2014, 3:56 AM)


Discretesignals
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Aug 6, 2014, 4:30 AM

Post #3 of 6 (2304 views)
Re: 1986 chevy k10 pickup fuel problem *urgent* Sign In

I wonder if it is possible to get the supply and return hoses switched at the pump?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Tom Greenleaf
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Aug 6, 2014, 5:03 AM

Post #4 of 6 (2300 views)
Re: 1986 chevy k10 pickup fuel problem *urgent* Sign In

At the age much of the lines could be rubber fuel line now? OE pump all the way to carb was metal flares both ends all metal.


Questions on top: These pushrod pumps could and were a pest to me with falling down of the end push cylinder which should in turn be to a pushrod to camshaft. If that failed it couldn't pump. If cam lobe worn I doubt it would be all at once.


Curious how you tested old pump as bad and new didn't solve it without something going wrong,


T



chummins2500
New User

Aug 6, 2014, 8:19 AM

Post #5 of 6 (2284 views)
Re: 1986 chevy k10 pickup fuel problem *urgent* Sign In

Well thank you for the help I will try chech this out. And the old pumps lever that makes contact with the pushrod was seized and didn't move at all.


Tom Greenleaf
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Aug 6, 2014, 9:14 AM

Post #6 of 6 (2276 views)
Re: 1986 chevy k10 pickup fuel problem *urgent* Sign In

Yikes - Just how seized - would think 99.9% would fall down and you would fight to hold the thing up and so slippery takes some tricks, wire bent just so and if not UP you'd bust lever of fuel pump if you got that far with it still down but don't think you could get it where you could?


I did find you can get just a pushrod and it showed one piece ~1/2" rod about 5+" long that rides an eccentric but all these fool years never had one break such that it didn't move and do it's thing so claim I DON'T KNOW with any certainty how that eccentric works or is driven and could be different for different years of same basic block?
(update on edit) >>>> it may not use a pushrod and never dealt with one that I recall but would look something like this below)

Not a clue if like this eccentric in pic......

Hope that shows both pump and the eccentric and not a clue if yours is like this - sorry. That is pushrod free by looks but see in center of cam sprocket the round, mounted off center riding the fuel pump lever.


I apologize that I really don't know what type you might have for sure. To see this would be a lot of work alone and there has to be better info without that.


Nothing for info is helping me help you. I/we need help from the others here just how this one is set up and what approach to take,


Tom



(This post was edited by Tom Greenleaf on Aug 6, 2014, 9:17 AM)






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