I've had two different Purolator pumps. (The pumps are alright, it's the regulators that are garbage)

The first one was loud. You could hear it rattling around under the car even when the headers were uncorked.

The second one is very quiet - you can only hear it if the windows are open, or if the fuel tank runs dry. It's about the same as the stock pump, although it's a "sharper" noise than stock.

Both were mounted the same way - attached to the factory fuel pump bracket. Because of the size/shape, using the OEM pump's rubber isolators wasn't practical, so it (they) was (were) bolted straight metal to metal.

 

I am running a Purolator pump and it rattles like hell! fits great and supplies all the fuel I need to my Mikuni however.

what is the part # for the quiet one?

 

I have a pump right now, well two......hard to explain. And it's pretty loud, I even kinda hear it with the car running.

 

Here is what I just installed. http://store.summitracing.com/partde...=CRT%2DP4600HP I only test-ran it briefly so far. It sounded louder than my lesser volume Carter on my REPU. I'll know more about the noise this high volume one makes after I get everything else ready to run. I bet I'll be able to hear it over the exhaust.

 

IMO, that accounts for about 75% of the noise.
I mounted my Carter on the flat behind the storage bin, under the car. The bins are cut out, but the doors are still there (making for about four times the space!).
In effect, the vibrating pump dead center the flat section of sheetmetal makes for a big, buzzing speaker!

 

**** ! ! !!

Good flow, not toooo loud, but bulky to mount other than that I'll second the mallory form experience.

oh yeah, and the Purolator's are trash unless for stock motors. nice small for easy install

-Ryan

 

Sterling, I mounted my Carter flat as well. I used the other three holes on top of the L bracket opposite of the pump's studs . I wanted to use mini motormount-looking things, but I only had two, so I just used a long bolt in the third hole. Test running the pump, it sounded louder than I was expecting. Perhaps the long bolt is transfering the sound? I buffered it on both sides with pieces of a radiator hose. Hmm.

Speaking of buzzing, my smaller volume Carter on my REPU makes a buzzing sound, but it's also got two rubber things (mini motormount style) as stand-offs.

 

Isn't the Carter a vane pump?
Why the hell's it so loud?

 

running a Purolator too. It's just slightly louder than stock.

 

They were both the same part, the 5-9 (?) psi rated unit.

And mine just died today with no warning. Driving to lunch at work and sputter, sputter, die. No fuel. Have to go in tomorrow with my old rattle-master and install that.

 

I just test-ran the high volume Carter again. Man it's loud! At first it was simple buzzing sound, not unlike the Carter in the REPU, but then when it started actually pumping fuel, it got seriously loud! Well, with luck, I guess I'll see (hear) how loud the exhaust is in comparison in a few minutes.

 

quote originally posted by REVHED:

"The most important thing I think as far as noise goes is where and how it's mounted."

By Sterling:

"IMO, that accounts for about 75% of the noise."

I agree, if I had bolted my NAPA pump to the undercarriage using the metal bracket they supplied, it probably would have been noisy. Instead, I put it inside the original cradle, which had lots of rubber mounts that were still in good shape, which is probably why it's so quiet.

Carl, the pump I got is the one they gave me for about $75 when I walked in off the street into a NAPA store in Athens, Georgia. I asked for a replacement pump for an 85 GSL with the 1.1 liter engine. It looks pretty much like the stock pump and like th Malories in Mar3s post, except the two nipples were in line instead of one being at 90 degrees. This meant I had to reroot the rubber feeds a bit, but nothing weird.

Ray

 

I'm running a Mallory Comp 70 Low Pressure -- PN 4070LP. I have twin Weber 36DCDs (the Rotary Engineering setup), and this pump's pre-set pressure of 3-4 PSI is perfect. I checked the pressure under WOT, and it stays above 3 PSI at all times. This means I don't have to run a regulator -- less parts is better parts.

BTW -- The tech reps strongly recommend you run this and any other non-bathed motor pump with the motor above the pump housing. If you don't, there's the outside possibility of a fire, or your Publisher's Clearing House check being misaddressed, or worse . . .

 

Is there such a thing as shielded fuel line? The fuel line coming out of my Mallory got cut by flying debris or something and I'd prefer to install some sort of shielded or braided hose now. Any thoughts on that?

 

You could go with all inch size tubing and braided hose and AN fittings. But it wont be cheap.

 

what do you mean by "inch size tubing"? The lines I have are 5/16". There is only one line that's especially vulnerable and it's the one from the pump to the existing hard line.

 

I meant removing the metric lines so you could go with AN stuff. But you actually only have one place your concerned with? Why not fab a metal shield for it?

 

You don't have to go that far.

Most fuel pumps have NPT threads in them, I think either 1/4" or 3/8" NPT. Get some NPT-to-flare or NPT-to-compression fitting adapters and run hardline (5/16" minimum) from the pump all the way up to the firewall (you need some rubber between the chassis and the engine) Cost: $10 or so.

 

The Mallory Comp110 has the 3/8" NPT ports...I'd have to pull the 140 to see, but it's buried again somewhere in the garage...

 

Update!

I think I know why the pump I put in the FB was quieter.

Yesterday I had the pleasure of swapping pumps (complete with mount bracket) in the parking lot at work.

The bracket from the '80 flat-bolts to the body.

The bracket from the '85 is rubber-bushed!

When did this change take place? Was it across all models or was it a GSL thing? The long bolts/studs holding the bushed bracket were all-threads so I was able to bolt the non-bushed bracket up with no problem. Odd that Mazda would use a long all-threads stud instead of a shanked stud, so *maybe* it's just a GSL thing?

The brackets, other than the larger holes for the bushings, are identical. One could try scrounging a bushed bracket for mounting the fuel pump.

As it is though, hory nutz! I forgot how loud this fuel pump was. It drowns out the engine when idling.

 

I can barely hear my Carter pump when the engine is running. The exhaust is unfinished and ends right behind the front seats. Man, it's loud inside that car right now.

 

My '84 GS has the bushings on the mounting bracket....

I found out yesterday when I installed my beautiful new ub3r-secret camouflaged BananaCarb (nicknamed "Banana... James Banana") that my fuel pump is dead. *sigh*

So now I'm looking to replace it. For now because I'm on a tight budget it's going to have to be a stock replacement pump... But I plan to get a mallory some time soon. I know the stock replacement pump won't supply enough fuel to the BananaCarb at high RPM, but I really need to make it to that meet on the 15-16th in Ottawa, so I'll do what I have to do for now.

Jon

 

I put a Carter EP10 in my car that says 4-5.5 psi (it's a stock '83) after having what seemed like fuel/vapor lock problems causing my rpm's to occasionally hesitate, usually at higher speeds. USUALLY. I also had this problem on the street a few times, once to the point of stalling. Since I put the pump in, the problem dissapeared, for a few months, then reappeared a few days ago. I'm suspecting the pump.
It was one of the unfortunate times when I had to buy a part from pep boys. I hear Carter is generally a good company though, right?
Hey, it's pretty quiet, though!
Not as quiet as stock, however.

 

I installed my Mallory Comp 70, which I bought on Bob (Inittab)'s suggestion.

Dude.. it's awesome. I haven't gotten the car running full yet (as per the other thread) but for the time I had it running, I couldnt' hear the pump at ALL. I hear it very slightly when I crank-and-stop... but only when I stop.

I've got it bolted to the underside of the car where the underside of the bins slopes up. I've got it bushed with half-inch-thick rubber washers (whose original purpose had someting to do with the stem of a faucet?.. I just found 'em in the plumbing dept at Canadian Tire and took 'em). It's great. Now if my mechanic can get it running well, I'll recommend this pump to EVERYBODY!

It is supposed to flow 70gph at 6psi, and I'm using a Holley 1-6psi regulator to bring the psi down to a managable level. If this thing is as quiet as stock and can push my BananaCarb to high RPMs, it's the best damn pump I could ask for !

Jon

 

How much for the Mallory comp 70 and the regulator?