Fuel pump...tried to go simple, didn't go simple enough. - Team Camaro Tech
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post #1 of 12 (permalink) Old Jan 11th, 17, 08:10 AM Thread Starter
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Jim
 
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Fuel pump...tried to go simple, didn't go simple enough.

After lurking/posting on various threads concerning fuel pumps, I decided to scrap the initial plan to use an electric pump, and just go with a mechanical. Simple, right?

I'll be running a QuickFuel 750 carb, and likely making around 400-425hp on the 383 stroker.
So...I purchased a Quickfuel mechanical carb, initernally regulated, thinking that would be a perfect match for the QuickFuel carb.

And it probably WOULD be, if there was anyway to get the inlet/outlet ports into a position that you could actually run fuel lines to them, due to the subframe/radiator hose/headers. Even rotating the bowl to move the ports, no way that pump is going to go in there, as far as myself, and 3 other motor guys who know a whole lot more about motors than I do, can tell.

So in my efforts to go simple, I guess I didn't go simple enough, and need to order a stock GM fuel pump.

Bottom line, it's never as easy as you try to make it

Jim
Hanging on the Gulf Coast

1969 RS/SS, 383, 4spd, 373s, 12bolt, FatMat, Vintage Air - Super Red, and it's my first Camaro.
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post #2 of 12 (permalink) Old Jan 11th, 17, 08:46 AM
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Darin
 
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Re: Fuel pump...tried to go simple, didn't go simple enough.

You can't find some A/N fittings with the bends you need to plumb it ?
I had a fancy A/C Delco Hi-Perf one that had the inlet outlets @180 deg from one another,still made it work fine.

1968 Butternut Coupe,
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post #3 of 12 (permalink) Old Jan 11th, 17, 08:51 AM Thread Starter
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Jim
 
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Re: Fuel pump...tried to go simple, didn't go simple enough.

The inlet to the pump, with no fittings, is 1/4" from the subframe. If I rotate it counter-clockwise (looking down on the pump) so that I can get to the inlet, the outlet is about 1/2" from the radiator hose.

Jim
Hanging on the Gulf Coast

1969 RS/SS, 383, 4spd, 373s, 12bolt, FatMat, Vintage Air - Super Red, and it's my first Camaro.
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post #4 of 12 (permalink) Old Jan 11th, 17, 09:12 AM
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Don
 
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Re: Fuel pump...tried to go simple, didn't go simple enough.

Surely you have inlet space say with the pump face mounted to block, in 7 ti 10 oclock position? I came from the fuel tank, along the top of the frame into the fuel filter, the inlet was pointing to the frame but I had a large inlet hole , I used a 45 street ell, . I used tube insulation to cover the inlet lines and filter. Is a low buck , positive way and works.

The outlet is as you see, with an AN fitting pointing up to my line to the carb.
I realize some lines run close to hoses or in path of air flow from radiator, thats why I used the silver heat barrier cover.

I use my own tuned 3310 for a carb. I have tried all the others and they all have some glitch about them I don't like.

I have cruised over 50K miles on this set up with a Holley chrome 11-327 pump and it works best. I run a stroker also.

Simple
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Don
TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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post #5 of 12 (permalink) Old Jan 11th, 17, 09:27 AM Thread Starter
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Jim
 
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Re: Fuel pump...tried to go simple, didn't go simple enough.

I'll take another look when I get back over to the car, with a fresh set of eyes...

Jim
Hanging on the Gulf Coast

1969 RS/SS, 383, 4spd, 373s, 12bolt, FatMat, Vintage Air - Super Red, and it's my first Camaro.
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post #6 of 12 (permalink) Old Jan 11th, 17, 10:28 AM
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kevin
 
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Re: Fuel pump...tried to go simple, didn't go simple enough.

I have a holley pump on my 68 and it is a very tight fit
I used two of these ell fittings and the outlet fitting is clocked tight against the bolt that covers the pump push rod
I believe I actually ground a little of the fitting
http://thumbs1.ebaystatic.com/d/l225...lAqXMM0Ycg.jpg

sound track of my 68 383

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post #7 of 12 (permalink) Old Jan 11th, 17, 10:48 AM Thread Starter
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Jim
 
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Re: Fuel pump...tried to go simple, didn't go simple enough.

The Carter 6900 is $$154 on Amazon, and $75 on Summit. That's odd...

Jim
Hanging on the Gulf Coast

1969 RS/SS, 383, 4spd, 373s, 12bolt, FatMat, Vintage Air - Super Red, and it's my first Camaro.
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post #8 of 12 (permalink) Old Jan 11th, 17, 11:32 AM
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Don
 
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Re: Fuel pump...tried to go simple, didn't go simple enough.

Quote:
Originally Posted by Lobstah View Post
The Carter 6900 is $$154 on Amazon, and $75 on Summit. That's odd...
I took the Carter 6900 off as it has 1/4'' NPT fittings vs the 12-327-11 Holley with 3/'8"' , I am not much for bling but its been with me a long time.

Don
TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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post #9 of 12 (permalink) Old Jan 11th, 17, 12:31 PM
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Dave
 
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Re: Fuel pump...tried to go simple, didn't go simple enough.

First order is a mechanical fuel pump (of the type driven off of the cam eccentric) is fixed at seven psi by virtue of the spring inside the pump. It is the pressure of the spring pushing against a diaphragm wall that forces fuel out of the pump at a constant pressure. If you have a belt driven fuel pump (like found on a fuel or alcohol car) then all bets are off.

There shouldn't be any need for a pressure regulator. But if you where to install one you would also need to install a return fuel line since all aftermarket fuel pumps are of a dead head design. You have to give the gas someplace to go with a pressure regulator.

Second point in reference to your issue with the location of the inlet and outlet. Every mechanical pump I have looked at allow you to rotate the bottom of the pump by unscrewing all of the fasteners and rotating it one way or the other then reassembling it with care to verify the diaphragm isn't torn by a rotating screw (I use Vaseline petroleum jelly to keep the rubber from wrapping around the threads and tearing the diaphragm).

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post #10 of 12 (permalink) Old Jan 11th, 17, 01:38 PM
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Re: Fuel pump...tried to go simple, didn't go simple enough.

My 6 banger has it mounted upside down.



Doesn't help you but thought you guys might find it a bit quirky. They're all mounted like this and a 350 fuel pump works fine but the hose connections are oriented like mine so they're a bit off. Had to get creative.
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post #11 of 12 (permalink) Old Jan 11th, 17, 01:57 PM
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Re: Fuel pump...tried to go simple, didn't go simple enough.

Simple is good. My 383 makes a bit more power than yours and is fed by a $17 parts house replacement pump. I have never starved it of fuel, though I don't drag race it. Used a repro z/28 fuel line to a $75 swap meet Holley 700DP, and was easy to set up.
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post #12 of 12 (permalink) Old Jan 11th, 17, 02:39 PM
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Re: Fuel pump...tried to go simple, didn't go simple enough.

Quote:
Originally Posted by BPOS View Post
Simple is good. My 383 makes a bit more power than yours and is fed by a $17 parts house replacement pump. I have never starved it of fuel, though I don't drag race it. Used a repro z/28 fuel line to a $75 swap meet Holley 700DP, and was easy to set up.
This.

You don't need anything more than a stock pump for your setup.

Don ~ TC Member #15 ~
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