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#748083 - Wed May 18 2011 04:00 PM Accelerator pump problem Edelbrock 1405 1898
Barsteel Offline
Shop Shark
Registered: Tue Nov 03 2009 10:39 PM
Posts: 272
Loc: Monroe, CT
Hello!

My '59 Apache has a 1970 350/300hp in it, a stock 4bbl intake manifold, and an Edelbrock 1405 1898 4bbl carb on it. When I got the truck, it was very hard to start and it stumbled when I accelerated. I found that the accelerator pump was not working...no shot of gas down the carb when you flicked the throttle. If I poured a shot of gas down the carb, the engine fired right up.

So...I replaced the accelerator pump plunger (along with the air horn gasket). The old plunger looked a bit cockeyed, so I figured that that was the problem.

Reinstalled the carb, same problem. Still no shot of gas down the carb.

I have no experience with Edelbrock carbs, so what else could be the problem? A schematic shows that there is a weight and spring in the accelerator pump circuit. Could this have gotten gummed up or ?

I'd appreciate any help on this one.

Thanks...

Chris
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#748174 - Wed May 18 2011 11:06 PM Re: Accelerator pump problem Edelbrock 1405 1898 [Re: Barsteel]
gotgasd Offline
Shop Shark
Registered: Sat Jun 26 2010 12:19 PM
Posts: 207
Loc: Nanaimo Vancouver Island
There's a check ball in the discharge line from the pump well into the carb. They get gummed up and stuck in place.
There should be a threaded plug in the front of the float bowl that you unscrew for access. Sometimes need a small screwdriver to dislodge it.
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#748566 - Fri May 20 2011 01:54 PM Re: Accelerator pump problem Edelbrock 1405 1898 [Re: gotgasd]
Z71Chevy Offline
Wrench Fetcher
Registered: Sat Jan 15 2011 03:16 PM
Posts: 129
Loc: Ohio,USA
Barsteel,have you checked your timing?I just put a 600cfm Edelbrock on my truck,it hesitated when I kicked it in to passing gear. I turned the distributor counter clockwise,just a little,and took it for a spin,cured my problem. We were going to check the timing,but just that little adjustment with the distributor cured the problem. Good Luck,and have a great weekend.
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#748639 - Fri May 20 2011 08:45 PM Re: Accelerator pump problem Edelbrock 1405 1898 [Re: Z71Chevy]
Barsteel Offline
Shop Shark
Registered: Tue Nov 03 2009 10:39 PM
Posts: 272
Loc: Monroe, CT
Z -

Not yet, a full tuneup is the next project.

Pulled the air horn, then removed the small cap that holds the discharge jets for the accelerator pump, pulled out the weight and check ball. Then blasted the carb body out with carb clean then compressed air. Shot a wad of crap out of the accelerator pump passage whilst doing so. Reassembled and installed. Problem solved...nice strong jet of fuel, no stumble or bucking during acceleration.

Thanks for the help.

Chris
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