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If I leave my car for a few days and go for a start I have to crank it for 20 seconds to get some fuel in the carby.
Its like not only has the carby leaked empty but the fuel line is also empty for some reason.
What would make the fuel run back down to tank level? Non-return valves in the fuel pump?
. . . and can the old original 350 fuel pumps be rekitted?
Thanx
"I would never want to be a member of a group whose symbol was a guy nailed to two pieces of wood" (George Carlin)
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I read an article on Quaddies some time ago, indicating that there are two pressed in plugs at the base of the carb somewhere. In earlier carbs, those plugs often leaked, allowing fuel to (presumably) drain away into the engine over time. This might explain why the bowl in the carb is empty, but not why the fuel line would be empty as well.
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not THE ANSWER ,BUT i ALWAYS RUN AN ELECTRIC fuel pump when I can to save starter /battery etc,I have
had alot of that happen ,various carbys and various causes ,but to stop it ,thats what I did..403ci
Jim in Adelaide.. |
Jim in Adelaide.. |
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Found a Wiki article about leaky Quadrajet plugs. Hope this helps. http://en.wikipedia.org/wiki/Quadrajet
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Here  is a picture that shows the secondary fuel wells in the base of the main body of the qjet. one with a plug in, one without. That is were they leak mainly but they can also leak through the primary's as well. This  is a picture of a carby that I removed the plugs on and then threaded the plug holes. They were then fitted with thread plugs which were then coated with epoxy resin as well. I am not sure about the wiki comment about the problem being fixed by the late 60s as the first picture is a 72 carby and the second is a 75 carby and I have also carried out this mod on 81 era Qjets and all had the same pressed in plugs that leaked. Cheers Paul. Edited by user Friday, 10 September 2010 9:16:35 AM(UTC)
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I would first start by making sure you have the correct 40658 AC Fuel pump , you have the correct 7042202 carb and has been restored correctly (not recoed) and that you have the correct base gasket and choke set up . www.monaromuscleparts.com
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quote:
Originally posted by hq ss
......I am not sure about the wiki comment about the problem being fixed by the late 60s as the first picture is a 72 carby and the second is a 75 carby and I have also carried out this mod on 81 era Qjets and all had the same pressed in plugs that leaked.
I totally agree with you on that one. Even commodore era quaddies have the plugs you've pointed out. If it's like anything else GMH sourced from the USA, we can't follow what the yanks say is right, as things changed along the way for them that didn't always change for us. Cheers, Mick _______________________________________________________________ Judge a successful man not on how he treats his peers, but on how he treats those less fortunate. |
Cheers,
Mick
_______________________________________________________________
Judge a successful man not on how he treats his peers, but on how he treats those less fortunate. |
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quote:
Originally posted by hq ss
Here
is a picture that shows the secondary fuel wells in the base of the main body of the qjet.
one with a plug in, one without.
That is were they leak mainly but they can also leak through the primary's as well.
This
is a picture of a carby that I removed the plugs on and then threaded the plug holes.
They were then fitted with thread plugs which were then coated with epoxy resin as well.
I am not sure about the wiki comment about the problem being fixed by the late 60s as the first picture is a 72 carby and the second is a 75 carby and I have also carried out this mod on 81 era Qjets and all had the same pressed in plugs that leaked.
Cheers Paul.
Thanks Paul I'll check it out when I get home next week. Its definately the correct carby for a 74 HQ 350 . . . . not out of the 60's
"I would never want to be a member of a group whose symbol was a guy nailed to two pieces of wood" (George Carlin)
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quote:
Originally posted by Monaro Muscle Parts
I would first start by making sure you have the correct 40658 AC Fuel pump , you have the correct 7042202 carb and has been restored correctly (not recoed) and that you have the correct base gasket and choke set up .
www.monaromuscleparts.com
I'll check my fuel pump when I get home and see if its a 40658. Time to give the carby a birthday I think. The carby is definately correct for a 74 HQ 350 I checked that a few weeks ago. Another thing with this carby is the choke. When I do eventually get fuel it floods like hell and I temporarily wired the choke open a bit so it only chokes 20% not 100% when cold. Runs ok after its warm though. Sounds more and more like I'll be checking for leaks. Thanks
"I would never want to be a member of a group whose symbol was a guy nailed to two pieces of wood" (George Carlin)
Edited by user Friday, 10 September 2010 11:27:43 PM(UTC)
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Nice pics Paul,I didn't realise it was a 350 hq,if so I wouldn't fit an electric pump to that.
Fuel draining back can be as simple as air in the system,lines etc,so give them a quick check too.p/s MMP James, Whats the difference between restored and recoed?There shouldn't be any difference.
I genuinely don't know(not being funny)
Jim in Adelaide.. |
Jim in Adelaide.. |
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Recoed is a word out of the 80s that wreckers used when spending the least they could on an item say like a starter motor or carby to resell for as much as they could and give you a short warranty painted in "reco" paint and on ya bike . Restored means just that . Every component of an item has been carefully inspected , replated , refinished , straightened, or whatever it takes to bring the item back to original spec or /and finish using traditonal techniques for a Restored car . I have tried to sell restored parts , and i have still had recalls on items , as some times 40 year old things are just worn and cannot be picked up by eye , and things leak etc.. so i am not claiming it like i am holier than thou either . www.monaromuscleparts.com
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OH! I see now what you mean,I was thinking of repco for engines and sprints for carbys etc.
ps I'm still in the 80's,just got my first car stereo with a USB...and They've been out for ages..lol
Jim in Adelaide.. |
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quote:
Originally posted by RigPig
If I leave my car for a few days and go for a start I have to crank it for 20 seconds to get some fuel in the carby.
Its like not only has the carby leaked empty but the fuel line is also empty for some reason.
What would make the fuel run back down to tank level? Non-return valves in the fuel pump?
. . . and can the old original 350 fuel pumps be rekitted?
Thanx
"I would never want to be a member of a group whose symbol was a guy nailed to two pieces of wood" (George Carlin)
What climate are you located in? The fuel could have evaporated if the level in the bowl is low due to a faulty float setting. If the fuel level was correct and has all leaked into the engine in just a few days then you would notice the car has a smokey idle as a result of the leaking into the inlet. Are you sure you are starting the car by the book? The 20 seconds you mention may be due to incorrect starting technique as you say the car runs fine when warmed up after fiddling with the choke setting. A few things try that won't cost money!
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