I would like to solve once and for all which fuel pump is the quietest. I currently run a holly red and it drives me NUTS.

Which is the quietest? Walboro, carter, mallory or something else....

Please include the model as well.

Thanks

 

I had both carter and walboro and I must say the carter is 3 times as loud

 

I run a Mallory Comp 70 and can't hear it unless I've got the bin open and I'm listening for it.

I bought it specifically because it is known to be the quietest but can flow enough for my Sterling.

Jon

 

Which walboro model do you use? The VPN-GSL392?

 

My Carter is very quiet. I used rubber washers.

 

And the carter being the CRT-P4070?

 

Nope, it's the noisier more powerful Carter GP4600HP.

 

Mounting the pump with some type of vibration suppression is the key. Rubber washers, old mouse pad, etc.. I also added a steel plate to inside of my bin to stiffen the sheet metal.

 

Your fuel pump isn't too loud -- you engine's too quiet. I have a pair of Bosch pumps and they're both pretty loud . . . until I start the car. When the car's running, I can't even hear 'em .

 

Loud *** carter pump. I got the rubber washer things behind the pump, but it is still loud. Then I start the car.

 

If you mount the pump to the frame rail what would a steel plate mounted to the inside of the storage bin do?

 

Mine is bolted to the frame. That's why it's quiet.

 

I think I will go with the mallory if it IS the quietest of them all. It is like $80 more but I like things quiet. I have the full racing beat exhaust so my car is nice and quiet already. My holly red give me a f-ing migrane when I am sitting at a stop light!

 

i have a mallory comp 70 and if the car isnt running i can kinda hear it but only if i turn everything off or im listening. when the car is running good luck haha i usually dont listen to my radio cuz its loud enough to block most things out. i do like hearing my pump tho sometimes....kinda comforting.

 

It's hard to hear my Carter when the engine is NOT running and impossible to hear it when it is running. My storage bin is removed.

 

it's only loud because you mounted it wrong. use plenty of bushings and you won't hear it. I can barely hear my blue and that's cause I mounted it right.

 

Don't get an A1000. I rubber-mounted mine and it is still loud.

 

Proper mounting is the key. Look at how well the original factory pump was mounted, and look at how quiet it was.

Just placing rubber between the pump and the chassis will not isolate noise and vibration, because the bolts will transmit the noise. For true noise and vibration isolation, the bolts must be completely rubber isolated from the pump and from the chassis - there cannot be any metal to metal touching anywhere - bolt to pump, bolt to chassis, nor nuts or washers to chassis.

 

Might suppress exhaust transmission noise, a little, won't make any difference in the pump noise. My pump is mounted on the backside of the bin, on a custom made plate to keep the pump vertical, as per mounting instructions.

 

Yeah the mallory is whisper quiet. I've got the Racing Beat exhaust system as well and I honestly can't tell it's running most of the time. Mine's was mounted to the underside of the bin with 1/4 rubber washers but I had to remove it at one point and just mounted it back without them. At night, when my idle is down around 650rpm and I've got everything turned off and I'm at a red light on a quiet street I can hear it if I'm listening for it.

Just be careful when mounting it that you put it in a spot where the swaybar will clear it. That was an issue with my stock swaybar, I mounted it without thinking about that and when I put the car back down on it's wheels I scraped the pump. I moved it like half an inch up or down and got the clearance I needed.

Oh, if you still have that plastic check-valve restrictor thing, remove it. I'm fairly sure I blew my first mallory because a) I used fuel hose that was too small and b) the "out" port of the mallory went through about 2" of hose, then directly into the check valve. That happened after a few months of use originally but I've had the replacement on there for four years now with no issues, once I took out that huge restriction.

Check Ebay, you can get them on there for cheap sometimes. The Comp70 and Comp110 are both good. I've run the Comp70 both times. Don't forget an FPR, though I figure if you've got a Holley pump right now you probably have one.

Jon

 

The carter was real quiet when it was brand new. Not running a fuel return line is hard on the pump and increases noise. I have rubber sheets and a 1st gen rx7 muffler hanger in between the frame and the pump. It was dead quiet when new, now it makes a racket (no return line is a pump killer).

 

I'm running a carter P4594 and have a RB SP dual exhaust. I can hear the pump at idle (when the music isn't cranked, which is rare) but at cruise without music I can't hear it. It doesn't really bother me, it's reassuring to know that at least the pump is still working. Plus it gives it more of a racecar aura. Hearing every part doing it's job, it's kinda nice.

 

I'm not too familiar with the part you're describing, but one nice thing about a check valve is that it keeps all the crud that's in the fuel system upstream of the pump from backwashing into it when you shut the car off. I removed the one in my fuel system, but I think I would have been wiser to keep it.

 

Um, if there's crap in your system, it would have gone into your carb by now. Perhaps your problem was something else.

 

As stated several times, you need to isolate the pump from the rest of the car. When I had my 85 I mounted the pump directly to the frame rail and could hear it all the time buzzing.

So when I got my 79 and upgraded with a carter pump again I was a little smarter. I used some 1/2" thick rubber padding and placed it between the bracket and the sheetmetal on the car. The pump is silent now since it doesn't have the car to resonate through.

So definitly try some rubber washers or padding before changing your pump.