All Small Six Fuel pump issues

[motopsycha]

I'm working to get my '66 mustang back on the road. The original fuel pump was toast so I picked up a cheap replacement from Autozone. Ran ok for a bit (a couple of trips around the block and some driveway tuning) but I started having carb flooding issues this weekend. I checked everything on the carb and all looked good. I put a gauge on it and it immediately pegged over 10psi.

I returned it and got a replacement and it was even worse, immediately blowing by my needle and seat and again pegged my pressure guage. Today I tried a Delphi pump from my local Napa and again the pressure was 10+ psi with the same result with my carb. The sales guy is bringing in another brand tomorrow but I'm getting discouraged. Is there any hope of finding a fuel pump that isn't putting out these high pressures?

 

[beanmiester]

What kind of carburetor are you using? You could try and use a fuel regulator before the carburetor. Different carbs require different psi. My weber needs 3 ish

 

[beanmiester]

The build quality of pumps has such a high tolerance now that it's hard to find a pump that produces the psi as advertised. I have a carter pump in mine that produces around 5 psi. I use a regulator to get it exact for my carb

 

[motopsycha]

What kind of carburetor are you using? You could try and use a fuel regulator before the carburetor. Different carbs require different psi. My weber needs 3 ish

I have a standard Autolite 1100. I know there will be some variation between pumps but all three I've tried appear to be way too high. I was hoping to avoid adding a regulator...

 

[beanmiester]

I have a standard Autolite 1100. I know there will be some variation between pumps but all three I've tried appear to be way too high. I was hoping to avoid adding a regulator...

I mean you could try buying a carter brand fuel pump. I got it from cj pony parts. I've only bought the one so I don't know how much the psi can vary. I went through like 3 napa pumps before before i ended with the carter. The most cost efficient solution would probably be a regulator assuming the other pumps end of reading too high. Someone else might know of a "premium" pump that might have a tighter tolerance.

If you decide to add a regulator it's not too bad. I mounted mine to the back of the firewall and used flex hose with a fuel filter before the regulator. For you mounting the regulator somewhere around the pump might be easier because the autolite has the fuel port to the front of the engine.

Good luck!

 

[Frank]

I'm getting discouraged. Is there any hope of finding a fuel pump that isn't putting out these high pressures?

Probably not. China junk unfortunately. They can go the other way too- last one on a 300 barely had 3psi.

The only other solution besides a regulator is a bypass fuel filter, and I can't say if it would bring pressure down sufficiently from those big #'s.
Still requires plumbing a return line. I run them back into the rubber line at the intake of the fuel pump.
A quality non-return regulator can handle 10psi. No return line with that. either solution requires some plumbing, but not extreme- and worth it to avoid flooding and carb damage.

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[lostintime]

When I first got my 223 running I had installed a new fuel pump and the engine would die due to fuel starvation. The pump just wasn't up to the job. Long story short I found the rocker arm of the fuel pump had a dead spot, when you push the arm down there was nothing for a short distance, as compared to the old pump I had taken out that when pushed down there wasn't any slop/dead spot. When the rocker arm was against the eccentric of the cam shaft it was moving the rocker arm of the pump further/stronger per downward stroke/motion as opposed to the dead spot/slop of the new one. I used two or three fuel pumps and made a good one that worked and is still working. When it should ever quit I will try to find one ready to go, but will also be willing to make another one that works.