Small Block Chevy Fuel Pump

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Small Block Chevy Fuel Pump

Post by Joe73 on Wed Jan 18, 2017 6:07 pm

Just FYI.  If anyone is looking for a fuel pump for their small block, I have some info.  I was looking for a pump with a few options.   I wanted

higher gpm than stock
3/8" fitting in and out
prefer a "clockable" base for fitting
no regulator required !!!

I like the Holley 12-327-11 which does fit the bill but I really didnt want chrome and not the $100 price tag.

So, after some research and reviews on the net I settled on the summit racing brand 110 gph pump.  Jegs has the same pump for the same price of $56.  Both pumps fit the bill all around except that they are both chrome but I'll deal with it.  A couple of forums mentioned that it was the holley pump. Some company has to make the pump because Summit does not manufacture them.

Now when you look at the pics of the summit and jegs pumps and match them to the Holley 12-327-11 they look AWFULLY similar.  

So I took the chance on the Summit in this link.   https://www.summitracing.com/parts/sum-250020-1/overview/make/chevrolet

It came today, I opened the box and found the numbers 12-327-11 stamped right on the flange.  So I think it would be safe to say that the summit pump is a Holley.  

I really wanted to try out a Carter pump which arent chromed.  I had my eye on the M6624 which put out 40gph at 7.5-9 psi.  I figured that would be more than stock.  But a quick search and I found the M6624 on rockauto an summit as being MY STOCK PUMP for my car.  Although a stock pump would be fine even for a performance application, I wanted a little more.  Coupled with the fact that a stock pump uses an inverted flare fitting going up to the carb.  So I'd have to get an adapter.

BTW, from all I've been reading, if you put a 90 degree fitting on a fuel pump, the resistance it causes is equal to adding 10 feet of straight pipe to the system.  I found that in several places and found it interesting.  I'm referring to a 90 pipe fitting.  Not a 'sweeping" radius 90 like holley and other sell.  They are fine and I will be using one.  

Just thought I'd post up my findings in case someone is in the market for a fuel pump.
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Re: Small Block Chevy Fuel Pump

Post by pila on Wed Jan 18, 2017 7:30 pm

Correct, about flow loss from anything other that almost straight line flow. Something I deal with occasionally. Even vacuum lines are affected, in the 3/8 inch size for example, when adding fittings other that straight..

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Re: Small Block Chevy Fuel Pump

Post by bigredlaguna on Wed Jan 18, 2017 11:27 pm

The factory style, if not original, fuel pump in the 74 had a straight fitting for the outlet. I didn't like it because it made the fuel line contact the lower radiator hose. The I.D. was 5/16" and the little gauge at the carb would read 3-5 psi all the time.

I put on a 90* fitting that is 3/8 I.D., and now the little gauge reads 5-7 psi all the time. Whether or not I restricted flow is something I don't know, but the smaller fitting was definitely a restriction based on pressure readings. The 90* fitting is just one of the square brass ones you can find at Autozone on the same rack as the panel clips, screws, etc.
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Re: Small Block Chevy Fuel Pump

Post by JF74chevelle on Tue Jan 24, 2017 12:32 am

Joe73 wrote:Just FYI.  If anyone is looking for a fuel pump for their small block, I have some info.  I was looking for a pump with a few options.   I wanted

higher gpm than stock
3/8" fitting in and out
prefer a "clockable" base for fitting
no regulator required !!!

I like the Holley 12-327-11 which does fit the bill but I really didnt want chrome and not the $100 price tag.

So, after some research and reviews on the net I settled on the summit racing brand 110 gph pump.  Jegs has the same pump for the same price of $56.  Both pumps fit the bill all around except that they are both chrome but I'll deal with it.  A couple of forums mentioned that it was the holley pump.  Some company has to make the pump because Summit does not manufacture them.

Now when you look at the pics of the summit and jegs pumps and match them to the Holley 12-327-11 they look AWFULLY similar.  

So I took the chance on the Summit in this link.   https://www.summitracing.com/parts/sum-250020-1/overview/make/chevrolet

It came today, I opened the box and found the numbers 12-327-11 stamped right on the flange.  So I think it would be safe to say that the summit pump is a Holley.  

I really wanted to try out a Carter pump which arent chromed.  I had my eye on the M6624 which put out 40gph at 7.5-9 psi.  I figured that would be more than stock.  But a quick search and I found the M6624 on rockauto an summit as being MY STOCK PUMP for my car.  Although a stock pump would be fine even for a performance application, I wanted a little more.  Coupled with the fact that a stock pump uses an inverted flare fitting going up to the carb.  So I'd have to get an adapter.

BTW, from all I've been reading, if you put a 90 degree fitting on a fuel pump, the resistance it causes is equal to adding 10 feet of straight pipe to the system.  I found that in several places and found it interesting.  I'm referring to a 90 pipe fitting.  Not a 'sweeping" radius 90 like holley and other sell.  They are fine and I will be using one.  

Just thought I'd post up my findings in case someone is in the market for a fuel pump.
I have an earls AN 90* fitting ion mine and doesnt seem to be starving it
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Re: Small Block Chevy Fuel Pump

Post by bracketchev1221 on Tue Jan 24, 2017 8:27 am

It is not as big an issue on the discharge side of the pump since there is such a low flow to the carburetor. You are only flowing whatever the needle valve can flow.
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Re: Small Block Chevy Fuel Pump

Post by Joe73 on Tue Jan 24, 2017 8:54 am

Adding a non sweep 90 degree fitting is like adding an additional 10 feet of fuel line.

I dont think you would feel any issues unless you were pushing the limits of the pump and setup.

The pump is just working a bit harder to do its job. Since the 90 is causing a "wall" and the pump has to overcome the extra resistance.
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tks for info

Post by 1975 S3 on Sun Jan 29, 2017 12:26 am

thanks for this, spring cleanup on the S3 includes new starter, fuel pump, Q-Jet rebuild, and maybe belts & hoses
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Re: Small Block Chevy Fuel Pump

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