1976 Astre Carb Issues ...

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1976 Astre Carb Issues ...

Postby Sunbird80 » Thu Aug 20, 2015 8:32 pm

It's been awhile since I've been on here ... still have my '80 Sunbird and my '76 Astre ... my question is about the Astre ... what carb does the '76 140 inch have? Holley 5200? I think that's what it is. Anyway, it will not hold it's prime ... if I crank it long enough to get some fuel to pump up then it will start ... but the battery usually gives out before that ever happens ... I've been priming it myself to start it. Once started,it will start all day ... until it sits overnight ... then it loses its prime again. Soooooo ... why is it losing its prime? Should I rebuild the carb? Get a remanufactured one? Also ... what is the best choke to use on these carbs? Mine just has the water activated choke with no electric function at all ... don't like that choke setup very much. Lots of questions I know ... sorry ... any info is greatly appreciated!!! Thanks!!!
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Re: 1976 Astre Carb Issues ...

Postby cjbiagi » Thu Aug 20, 2015 8:52 pm

I am not familiar with the Holley 5200 but I know Quadrajets have a similar problem because there are some plugs on the bottom of the float bowls that leak. They will slowly drain the fuel from the bowls into the intake and are dry on startup. The usual fix is to either replug them and or epoxy them so they don't leak. You may have a issue with the floats as well but I would think a tear down would be best to see what's going on in there. Here is a pic of a 5200 for ID purposes.
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holly 5200.JPG
holly 5200.JPG (60.19 KiB) Viewed 266 times
Clyde.........75 Monza 2+2
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Re: 1976 Astre Carb Issues ...

Postby kgroombr » Fri Aug 21, 2015 8:19 am

You may have a fuel pump problem. The fuel pump may be allowing fuel to seep past it when not in use so the fuel line will have nothing in it when you go to start the engine. You have to crank the engine to get the oil pressure switch to engage, which enables the fuel pump.

A quick test would be to bypass the oil pressure switch and listen to see how long it takes for fuel pressure to build. Initially the fuel pump will run fast when pushing fuel, but when it reaches pressure, it sounds like it is bogging down.

My 76 Vega fuel pump has a little bit of seepage, but it doesn't go too far overnight and usually gets pressure after a second or two.

Ken
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Re: 1976 Astre Carb Issues ...

Postby marco_1978_spyder » Fri Aug 21, 2015 6:08 pm

Does that carb use in in-carb filter like the Varijet and Q jets? Could be as simple as someone left out the one way check valve (plunger) that fits inside the filter.
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Re: 1976 Astre Carb Issues ...

Postby marco_1978_spyder » Fri Aug 21, 2015 6:08 pm

Does that carb use in in-carb filter like the Varijet and Q jets? Could be as simple as someone left out the one way check valve (plunger) that fits inside the filter.
1978 Monza Spyder V8 4speed, posi
1978 Sunbird Formula V6, 5 Speed, Hatchback
1978 Sunbird notchback 4cyl Auto
2006 Chevrolet Aveo 5 speed Hatchback
Yes, you can refer to me as Mark
Please visit my blog... http://chevymonza.blogspot.com/ Follow if you like!
Featuring special guests; Carl Beraytor and Ray D'atore

My Red spyder now has a youtube channel please Like and Subscribe!!!
https://www.youtube.com/channel/UCOzzSR ... ISuing7KLA
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Re: 1976 Astre Carb Issues ...

Postby HI WINDING MONZA » Tue Aug 25, 2015 7:54 am

Carb for 76 Astre:
astre carb.jpg
astre carb.jpg (10.71 KiB) Viewed 226 times


Filter with valve :
76 astre 2 bbl fuel filter.jpg
76 astre 2 bbl fuel filter.jpg (7.15 KiB) Viewed 226 times


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