The Portal Hub: All things Pinzgauer, Haflinger, Volvo 303 and more.

The Portal Hub: All things Pinzgauer, Haflinger, Volvo 303 and more.

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 Carburetor acceleration pumps trouble 
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Joined: Sun Dec 21, 2008 10:50 am
Posts: 113
Location: Atlanta
Post Carburetor acceleration pumps trouble
Again back to my carbs. Truck is running rich, due to low power, stumbling, out of idle. I can't load the engine without pumping the throttle and revving it up before releasing clutch. Only way to alleviate problem is to pull out the idle screws out about 3 to 4 turns, which make other problems, like backfiring on deceleration and foul smell from exhaust.

So I started to look for carburetor acceleration pump troubles. When I look at the fuel coming out of the 01-40-32 injector tubes, some have a very smooth stream, straight down, others have like a fan type of spray. I thought maybe they had debris on them, so took a couple out and passed some thin copper wire through them. No difference.

I am starting to doubt about the linkage, I read here on the forum that manuals show diagrams with the levers set on the most outer hole on the lever, but some manual pictures showing the levers installed in the most inner... followed the diagram, not the pictures.

How about the valves? (01-40-49 and 51) Any typical failure there? Those are expensive!! I'll spend $200 just on those but before I do that... should I get a new carb?
The pumps themselves are new, just changed them with the carb kit replacement.

Something that I remember during rebuilding was some play in the linkcage arms, I will have to recheck that in the process...

Any advice on these acceleration pumps not working will be appreciated.
Jeronimo

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Jerome
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Sun Sep 24, 2017 1:21 pm
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Joined: Fri May 01, 2009 12:30 pm
Posts: 1738
Location: Detroit Motor City
Post Re: Carburetor acceleration pumps trouble
Does it idle fine?

Are you sure its not leaky butterfly shafts? They commonly wear out

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1973 712m
(2) 1968 Haflingers 1 For Sale
1978 GMC Palm Beach
1979 Mini Ranger For Sale
1986 Corvette For Sale
2001 F250 Diesel and trailer
Company Cars
2017 MKT
2018 F-150


Sun Sep 24, 2017 6:35 pm
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Joined: Sun Dec 21, 2008 10:50 am
Posts: 113
Location: Atlanta
Post Re: Carburetor acceleration pumps trouble
I have sprayed carburetor cleaning fluid on both ends without any success in changing the RPMs. Any other suggestion on how to test this?
Thanks,
Jeronimo

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Jerome
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Sun Sep 24, 2017 9:37 pm
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Joined: Sun Oct 23, 2016 10:02 am
Posts: 243
Location: Mesquite, NV
Post Re: Carburetor acceleration pumps trouble
We had a similar problem on ours, replaced the pump suction and pressure valves and the accelerator pump jets and nozzles, runs great now. Fuel was dripping from the nozzles. Probably could have purchased rebuilt carbs for not a lot more than what we spent on rebuilding ours.

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1971 Pinzgauer M710, all stock including 245-16 Maloya tires, taken off and stored for show
BFG MT KM2 265/75R16's on Black SAV replacement rims on now


Mon Sep 25, 2017 1:12 pm
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Joined: Sun Dec 21, 2008 10:50 am
Posts: 113
Location: Atlanta
Post Re: Carburetor acceleration pumps trouble
Hi Bbolander,
I did read your previous posts on the issue... like you said, paying $50 per valve... 4 of them! Might as well go with two new carbs or EFI!
I will take them apart tomorrow and check again the valves...
JC

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Jerome
CRJ Driver


Mon Sep 25, 2017 9:51 pm
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Joined: Sun Dec 21, 2008 10:50 am
Posts: 113
Location: Atlanta
Post Re: Carburetor acceleration pumps trouble
Problem almost solved... changed Idle Jets from 55 to 60 (also went from no o-ring type to Oring type.)

Runs very well.. but still with 2,25 turns on the idle screws. Less and it does not like much the transition from idle to 1600 rpms.

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Jerome
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Fri Nov 24, 2017 11:30 pm
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