Accelerator pump question

« **on:** June 13, 2014, 02:41:34 PM »

I have a Holley 650 I believe and the accelerator pump is leaking bad. I know I need to replace the diaphragm but I don't know where to get one ASAP. Also are there different sizes. And how can I be sure I get the right one. I am in Corona and don't know of any places near by.

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« **Reply #1 on:** June 13, 2014, 02:46:42 PM »

if you get the list # off the carb that gives the parts guy or gal all the carb info. also i THINK not pos but arnt they all the same the spring is whats diff??? any good proformance house should have them!

« **Reply #2 on:** June 13, 2014, 03:43:39 PM »

Different colors for different volumes.

Providing original Holley parts were used in the past.

Hit me with the list# and I can come up with a part#...

It is likely a 134-12 (30cc) or a 135-14 (50cc).

GT

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« **Reply #3 on:** June 13, 2014, 03:50:53 PM »

Different colors are used for running different types of fuel

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« **Reply #4 on:** June 13, 2014, 03:54:09 PM »

I've got all mine from oreily auto parts and just matched it up (yes Holley makes it) not a china one I think it runs about 5$

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« **Reply #5 on:** June 13, 2014, 04:03:43 PM »

Quote from: RiverRat474 on June 13, 2014, 03:50:53 PM

Different colors are used for running different types of fuel

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You are correct... I had pump cams on my mind...

Thanks for looking out...

GT

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« **Reply #6 on:** June 13, 2014, 04:14:21 PM »

J & M Speed Center
3230 Motor Cir
Riverside, CA 92504
(951) 688-7110

http://jmspeedcenter.com/

« **Reply #7 on:** June 13, 2014, 05:10:45 PM »

Where can I find the list number? I took the air filter off and found 1850-5 and 0842 right underneath that.

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« **Reply #8 on:** June 13, 2014, 05:15:02 PM »

Where can I find the list number? I took the air filter off and found 1850-5 and 0842 right underneath that.

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« **Reply #9 on:** June 13, 2014, 05:16:43 PM »

And just so I'm sure, what I'm pointing at is the accelerator pump right? And should I just change the diaphragm or the whole thing? I only know enough to be dangerous.

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« **Reply #10 on:** June 13, 2014, 05:27:03 PM »

Yes, you are pointing to the accelerator pump. I am sure just the diaphram. Call Steve at J&M and he can help you with the numbers. Tell him hi from Joe from Custom Engineering. You shouldn't need to replace the whole thing unless you are changing the volume (BTW, don't do that).

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« **Reply #11 on:** June 13, 2014, 06:59:55 PM »

I can't remember the exact size, it should be the standard 30cc (I think) diaphragm.

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« **Reply #12 on:** June 14, 2014, 09:02:30 AM »

The 1850-5 is a 600 cfm carb with vacuum secondary's. if it hasn't been modified it comes stock with a 30cc pump. I have two on top of my tunnel ram and they work great.

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« **Reply #13 on:** June 14, 2014, 09:58:16 AM »

Problem is I think the carb has been modified some. Would I be able to tell which diaphragm if I took it off and looked at it?

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« **Reply #14 on:** June 14, 2014, 10:03:14 AM »

The 50cc pump bowl is deeper. Go to holley's website and you can see the difference in the two

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« **Reply #15 on:** June 14, 2014, 10:09:08 AM »

This is what I have. I will compare notes on the holley site too.

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« **Reply #16 on:** June 14, 2014, 10:12:01 AM »

Okay well the 50 looks to be considerably taller so it's for sure a 30. Thanks fellas

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« **Reply #17 on:** June 14, 2014, 10:14:03 AM »

And real quick because I forgot what it looked like when I pulled it off, but the raised side of the diaphragm goes into the bowl if the housing. Am I correct?

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« **Reply #18 on:** June 14, 2014, 10:20:16 AM »

Yes your correct and that's a standard holley accelerator pump just buy a renew kit for it the number of the carb is stamped on the choke housing .you can check the metering block the number on it should match the choke number, also you're going to need a butterfly drive or clutch head screw driver bit to get the metering plate off of the rear of the carb to rebuild it.

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« **Reply #19 on:** June 14, 2014, 11:38:46 AM »

Quote from: JTMoney on June 14, 2014, 10:14:03 AM

And real quick because I forgot what it looked like when I pulled it off, but the raised side of the diaphragm goes into the bowl if the housing. Am I correct?

The spring goes into the float bowl first, the concave side of the diaphragm goes over the spring, and last the accelerator pump cover and arm go over raised side of the diaphragm. The spring opens pushes against the float bowl and the diaphragm to expand the volume to draw fuel from the bowl into the accelerator pump. When you mash the throttle, the linkage actuates the arm which pushes the diaphragm forcing the volume of fuel to move past the check valve, through the body, and discharge through the discharge nozzle(s). Just remember, the spring acts against the linkage arm to pump the fuel. Without this, fuel will not be drawn into the accelerator pump.

« **Reply #20 on:** June 14, 2014, 02:32:07 PM »

Well thanks for all the help guys. It's back together and no leaks.

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« **Reply #21 on:** June 14, 2014, 03:13:39 PM »

Quote from: JTMoney on June 14, 2014, 02:32:07 PM

Well thanks for all the help guys. It's back together and no leaks.

JTMoney

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