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I think I got taken to the bank

Nxcoupe said:
Regulator? On a stock fuel pump? Why?
Click to expand...
For this very reason, stock style pumps can vary from one pump to another I have seen many times. Everything made today is junk. I can't get one good part anymore. Even my brand new Edelbrock VRS 750 carburetor is having issues with the idle mixture screws. The passenger side works fine but the drivers side I can screw all the way into the seated position and it doesnt' effect anything. SMH JUNK JUNK JUNK
 
From my experience in aviation, regulators fail....a lot. Whether hydraulic, oxygen, etc, even ground equipment. I would suspect a bad regulator before a pump. Bypass it and see what happens.
 
JARRETT LYNCH said:
For this very reason, stock style pumps can vary from one pump to another I have seen many times. Everything made today is junk. I can't get one good part anymore. Even my brand new Edelbrock VRS 750 carburetor is having issues with the idle mixture screws. The passenger side works fine but the drivers side I can screw all the way into the seated position and it doesnt' effect anything. SMH JUNK JUNK JUNK
Click to expand...
How about getting an original one refurbished? Or an AVS, Thermoquad if the Eddy isn’t doing the job..
 
OKDart said:
From my experience in aviation, regulators fail....a lot. Whether hydraulic, oxygen, etc, even ground equipment. I would suspect a bad regulator before a pump. Bypass it and see what happens.
Click to expand...
Regulator is brand new and I did remove it and plumb directly to fuel rail awhile ago and nothing changed
 
Does anyone know the fuel pump rod travel? I need to measure it to see if the cam lobe is worn a little but I have searched all day on the web and can't find a spec.
 
JARRETT LYNCH said:
Yeah I saw that, he said about .300 inches which means he doesnt know for sure. some said .4-.5". I need legit specs
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I am not an engineer, but I would think that there could be as much as a few thousands of an inch tolerance. Surely all fuel pump rods were the same length.
 
440 4 speed said:
I am not an engineer, but I would think that there could be as much as a few thousands of an inch tolerance. Surely all fuel pump rods were the same length.
Click to expand...
I'm going to measure mine tonight after work and see what we got. would going from 3/8 fuel line to 8 AN line at the carb make any difference in pressure? I wouldn't think so
 
This is out of my 68K original mile 1966 Hemi Satellite

IMG_1541.jpeg
 
I have several pump pushrods and mine measure the same 3.22”.
My car runs around 3-4 psi, running up to 7 at 2000 rpms.
I used a Carter high volume pump through a regulator set to 7 psi. When I first installed it, the Carter ran 11 psi with no regulator on it! Adding the regulator solved that. Everything over 7 returns to the tank.
I do not have any fuel related issues. I can drive in 110 degree weather and it drives fine. Hot restarts are fine and never any vapor lock or fuel starvation.
 
Last edited:
So I had an idea to run another pressure gauge where I had my fuel filter after the pump and I took my fuel pressure regulator off again that way I could monitor pressure closer to the pump. Fired engine up and both gauges were reading 7psi! WTF ‍♂️
Now reminder, I took the fuel pressure regulator off before and ran it like this before with the same low pressure issue. The only thing different is this time I removed the fuel filter and installed an in line fuel pressure gauge in its place. So I thought maybe the brand new fuel filter is bad. It’s an Edelbrock clear glass type and nope there was nothing in it an blew air right through it. So I put the fuel filter back on and started it up again and now pressure is at 7 psi all good. I have no idea how. Maybe air pocket in fuel pump diaphragm ‍♂️
Here’s vid of it running
IMG_2698.jpeg
 
I think it was the new regulator the whole time. The first time I took it off and ran the engine, I didn't know about resetting the liquid fuel gauge. So it is possible that when I took the regulator off that the fuel pressure gauge was reading incorrectly. Now that I took the regulator off the second time, i had reset the pressure gauge. I'm going to take the regulator apart and see if I can find anything. This pump is internally regulated to 6.5psi and I don't have any fuel coming into the boosters due to high fuel pressure so I'm just going to run it without a regulator and see how it goes. Test drive when I get home from work today. Thanks for all the help guys
 
There is a recall on some Holley pressure regulators.
 
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