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Weird Holley Accel Pump problem UPDATE #1384154 02/09/13 07:56 PM 02/09/13 07:56 PM
Joined: Jan 2003 Posts: 20,773 A collage of whims topside OP Too Many Posts
topside OP Too Many Posts Joined: Jan 2003 Posts: 20,773 A collage of whims	Here's something I've never run into before (800DP): When running, Sec pump arm is locked, won't move. Pull carb off, disassemble, reassemble, works fine. Back on motor, start up, locks up again. Check ball @ pump is free, arm isn't bent. Right now with engine off, adjustment backed completely off, still locked. Probably the 20th Holley I've been through at least; what did I miss? Carb was built up from a buddy's spare parts but otherwise seems OK.

Re: Weird Holley Accel Pump problem - ??? [Re: topside] #1384155 02/09/13 09:14 PM 02/09/13 09:14 PM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	did you replace the pump diaphragm ? had something happen on primary pump.. Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

Re: Weird Holley Accel Pump problem - ??? [Re: 70AARcuda] #1384156 02/09/13 09:18 PM 02/09/13 09:18 PM
Joined: Jan 2003 Posts: 20,773 A collage of whims topside OP Too Many Posts
topside OP Too Many Posts Joined: Jan 2003 Posts: 20,773 A collage of whims	Oh yeah, all new gaskets & etc. I should add that when I check it before putting it back on the car (no gas in carb), the lever is free.

Re: Weird Holley Accel Pump problem - ??? [Re: topside] #1384157 02/09/13 09:30 PM 02/09/13 09:30 PM
Joined: Jan 2003 Posts: 32,394 Q Quicktree I Win
Quicktree I Win Q Joined: Jan 2003 Posts: 32,394	it could be clogged somewhere not letting fuel out.

Re: Weird Holley Accel Pump problem - ??? [Re: topside] #1384158 02/09/13 09:38 PM 02/09/13 09:38 PM
Joined: Nov 2007 Posts: 21,823 Kirkland, Washington Pacnorthcuda Too Many Posts
Pacnorthcuda Too Many Posts Joined: Nov 2007 Posts: 21,823 Kirkland, Washington	Could the intake be interfering with the pump arm? I had that happen with a 50cc pump on a eddy RPM

Re: Weird Holley Accel Pump problem - ??? [Re: 70AARcuda] #1384159 02/09/13 09:41 PM 02/09/13 09:41 PM
Joined: Nov 2004 Posts: 1,708 S. Il. U.S.A. 5spdcuda top fuel
5spdcuda top fuel Joined: Nov 2004 Posts: 1,708 S. Il. U.S.A.	Check the float bowl gasket. There is a small hole in the gasket for the fuel to flow through. Sometimes if you reuse a gasket often enough the hole becomes flattened and distorted enough to prevent fuel flow.

Re: Weird Holley Accel Pump problem - ??? [Re: topside] #1384160 02/09/13 09:43 PM 02/09/13 09:43 PM
Joined: Jan 2003 Posts: 6,840 The Swamp S Sixpak master
Sixpak master S Joined: Jan 2003 Posts: 6,840 The Swamp	I've had the hole in the bowl gasket close up when the screws holding the bowl get tightened. Check the die cut hole in the gasket. Teflon coated ones tend to do it less, the black thick paper ones or brown ones are usually the culprit. Old bowl gaskets used to only punch one hole for the pump passage and if you put the gasket on backwards it would block the hole. Most new gaskets have two holes in them to prevent this problem.

Re: Weird Holley Accel Pump problem - ??? [Re: Sixpak] #1384161 02/09/13 11:02 PM 02/09/13 11:02 PM
Joined: Jan 2003 Posts: 20,773 A collage of whims topside OP Too Many Posts
topside OP Too Many Posts Joined: Jan 2003 Posts: 20,773 A collage of whims	I'll get the carb off & check the bowl gasket, passages, sec. needle & seat. Arm isn't hitting anything. I'm amazed at how locked-up-solid it is. Thanks for the input so far.

Re: Weird Holley Accel Pump problem - ??? [Re: Sixpak] #1384162 02/10/13 12:20 AM 02/10/13 12:20 AM
Joined: Jan 2003 Posts: 1,090 Saskatchewan, Canada B barracudabob super stock
barracudabob super stock B Joined: Jan 2003 Posts: 1,090 Saskatchewan, Canada	Quote: I've had the hole in the bowl gasket close up when the screws holding the bowl get tightened. Check the die cut hole in the gasket. Teflon coated ones tend to do it less, the black thick paper ones or brown ones are usually the culprit. Old bowl gaskets used to only punch one hole for the pump passage and if you put the gasket on backwards it would block the hole. Most new gaskets have two holes in them to prevent this problem. X2 Had this happen on a 600 Holley. Gasket only had one hole for acc pump. I had it on backwards, and the arm wouldn't move.

Re: Weird Holley Accel Pump problem - ??? [Re: barracudabob] #1384163 02/10/13 12:35 AM 02/10/13 12:35 AM
Joined: Jan 2013 Posts: 174 H hustlin hoosier member
hustlin hoosier member H Joined: Jan 2013 Posts: 174	You have a plugged passage somewhere . since it impossible to compress a liquid the arm is loched solid.

Re: Weird Holley Accel Pump problem - ??? [Re: hustlin hoosier] #1384164 02/10/13 11:10 AM 02/10/13 11:10 AM
Joined: Dec 2008 Posts: 1,285 okla. sam64 pro stock
sam64 pro stock Joined: Dec 2008 Posts: 1,285 okla.	i would be looking at the check under the squirter.

Re: Weird Holley Accel Pump problem - ??? [Re: sam64] #1384165 02/10/13 03:00 PM 02/10/13 03:00 PM
Joined: Jan 2003 Posts: 20,773 A collage of whims topside OP Too Many Posts
topside OP Too Many Posts Joined: Jan 2003 Posts: 20,773 A collage of whims	That looked OK last time, but I'll have the carb off & apart later today and check passages, gaskets, etc. I'll post what I find...or another question... Appreciate the input so far, thanks.

Re: Weird Holley Accel Pump problem - ??? [Re: sam64] #1384166 02/10/13 03:09 PM 02/10/13 03:09 PM
Joined: Nov 2009 Posts: 3,410 Belpre,Ohio C CHAPPER master
CHAPPER master C Joined: Nov 2009 Posts: 3,410 Belpre,Ohio	Quote: i would be looking at the check under the squirter. Have seen them get a burr where they seat. I take a small pin punch and place on the top of the check, while it is seated, and tap with a hammer to clean up the seat/check area. If you like drag racing, support your local track.

Weird Holley Accel Pump problem UPDATE [Re: CHAPPER] #1384167 02/10/13 05:02 PM 02/10/13 05:02 PM
Joined: Jan 2003 Posts: 20,773 A collage of whims topside OP Too Many Posts
topside OP Too Many Posts Joined: Jan 2003 Posts: 20,773 A collage of whims	Turns out the metering block (where the jets & PV attach) has NO HOLE at the gasket surface to feed the accel pump. Gasket is fine & correctly located. Accel pump squirts when the bowl is removed. Seems like if I drill that hole into the passage (obviously blow air through to clean & test) that it'll work. Accel pump must be filling with fuel and without a route out to the block, the lever can't move, right? What size hole: same as the depressed locating area? Anyone seen this before?

Re: Weird Holley Accel Pump problem UPDATE [Re: topside] #1384168 02/10/13 06:22 PM 02/10/13 06:22 PM
Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA bigtimeauto Trophy Winner
bigtimeauto Trophy Winner Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA	you have a vac secondary meetering block not one from a dbbl pumper BB, TT5,Procharged 3300lb Street Car 4.79/154

Re: Weird Holley Accel Pump problem UPDATE [Re: bigtimeauto] #1384169 02/10/13 06:45 PM 02/10/13 06:45 PM
Joined: Jan 2003 Posts: 20,773 A collage of whims topside OP Too Many Posts
topside OP Too Many Posts Joined: Jan 2003 Posts: 20,773 A collage of whims	D'oh! Any idea on hole size? Passage is drilled near PV, well plug at bottom of diagonal feed passage tells me that's drilled. My guess is that same size as hole near PV is OK, but...

Re: Weird Holley Accel Pump problem UPDATE [Re: topside] #1384170 02/10/13 06:55 PM 02/10/13 06:55 PM
Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA bigtimeauto Trophy Winner
bigtimeauto Trophy Winner Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA	its actually 3 holes you will have to drill and then plug the bottom of the block where you drill. just look at your front block. I'm not even sure if you have the boss in that block. not to mention the fueling is also going to be off as the emulsion tubes are different on pumpers versus vac secondary carbs. BB, TT5,Procharged 3300lb Street Car 4.79/154

Re: Weird Holley Accel Pump problem UPDATE [Re: bigtimeauto] #1384171 02/10/13 10:12 PM 02/10/13 10:12 PM
Joined: Jan 2003 Posts: 20,773 A collage of whims topside OP Too Many Posts
topside OP Too Many Posts Joined: Jan 2003 Posts: 20,773 A collage of whims	Actually, 2 of the passages are drilled, just not the one to the diagonal feed from the pump. But your comment on the emulsion is a good thought: probably not a good idea to screw up the "baseline". Found the proper block for sale, which is most likely the best fix. Moral of the story here is to NOT throw a carb together during a few beers with friends in a nearly dark garage!

Re: Weird Holley Accel Pump problem UPDATE [Re: topside] #1384172 02/10/13 10:49 PM 02/10/13 10:49 PM
Joined: Nov 2009 Posts: 3,410 Belpre,Ohio C CHAPPER master
CHAPPER master C Joined: Nov 2009 Posts: 3,410 Belpre,Ohio	This should be in the DAMHIK thread... If you like drag racing, support your local track.

Re: Weird Holley Accel Pump problem UPDATE [Re: CHAPPER] #1384173 02/10/13 11:59 PM 02/10/13 11:59 PM
Joined: Jan 2003 Posts: 20,773 A collage of whims topside OP Too Many Posts
topside OP Too Many Posts Joined: Jan 2003 Posts: 20,773 A collage of whims	That crossed my mind, but it's embarrassing enough already!

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