Electric fuel pump noise.

3

39topless

Well-known member
I absolutely hate the noise from my (Holley) electric fuel pump that is mounted to the rear cross member of my '39. Is there any way to muffle the noise without causing damage to the pump? I thought of perhaps using that foam rubber stuff that you can wrap around water pipes to keep from freezing.
Thanks, Phil
 
I'm not familiar with the Holley pump. If it is not mounted on rubber isolators, maybe they will help. You will need to maintain a good ground, though, if it grounds through the mount.
 
When I put electric pump on my 39 it made loud noise. I had been wielding and didn't disconnect the both battery terminals. the voltage was low and alt was damaged. I put new alt and its been good. I guess you could try No alt or gen wired in car.
 
Wrapping it in pipe insulation won't help. The sound is being transmitted though the mounts. Rubber mounts are the best you can do.
 
There are quieter pumps than the Holley. I've used an inline pump with filter on my last 2 FH deuce roadsters and they were virtually silent.
 
Most electric Holley pumps are quite noisy especially the race type.
Two solutions that work very well can be borrowed from race car
applications.
1- Go to a pressurized tank with the air pressure coming from the stock fuel pump.
2- Use a belt driven mechanical pump as used on race cars.
 
Carter P60504 inline fuel pump. Look it up on Summits site. 4 PSI pumping pressure. Inexpensive, under 40 bucks. Read the comments.
 
I used a Carter pump on my car.It was noisy also. But I solved the noise problem by having loud mufflers. Once the engine starts running, I can only hear it, not the pump. So.....run some glasspacks...☺
 
I mounted my Airtex pump like this (below). It makes a soft thumping noise when I first turn on power after several days' sitting, quiets down to indiscernable levels once it reaches pressure. Once the engine starts I can't tell it's there.
 

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I have a Holly pump works great I hear it when I turn on the key, then I knows it is working, shut off the pump before I turn off switch runs out of fuel.
 
I had the same problem with Holley Blue pump in my roadster at first.
There was a pressure regulator with no bypass to tank , so , because
pump was so efficent , it kinda pumped "against the wall" all the time.
I did change the regulator where is return line and put it next to the pump
and made return line back to the tank. Works like a charm.
Holley Blue is vane pump and it should be very quiet .
And dont forget those rubber isolators.

Ari
 
I used a short section of radiator hose (complete circle) mounted it to the cross member and then bolted the fuel pump to the hose. It isolated the pump from the frame very well and lasted several years. Since then I have changed to another pump and so I cannot attach a picture of the "rig".
 
2X Airtex They are quiet, might need a fuel pressure regulator if you are running a 94 or 97 carb
 
Use a piece of hose on the inlet and outlet of the pump. Vibration/noise travels thru solid tubing/pipe.
Bruce
 
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