V8kilr

i need a new fuel pump and pressure regulator,i was thinking of going with the carter Super Street Pump 180-P4070 carter pump


and the holley regualtor,but i don know which one,go here and lmk, holley regulators


lmk if i have the right setup inmind,im currently running a modded nikki,a rb exhaust,and plan to throw on my mikuni 44's this summer,next summer im using my tax returns for a camden supoercharger and will ahve to upgrade again,but for now lets focus on this,thanks

cletus

I'm interested in seeing what becomes of this discussion. I have a fuel pump that is apparently dying. Makes a lot of noise. Always has since I got the car (not too long ago). I changed the fuel filter, and now the pump is sometimes quiet, other times just as loud (as compared to always loud). I'm afraid permanent damage was done to the pump with the clogged filter so I am thinking of changing the pump. I'm running a stock carb on a 12A. I think I have a pressure regulator on the line going to the carb as it is. I have a little round **** on something in the line that is numbered like 1 to 4 or so with .5 increments I'm guessing that's what it is. I have no idea what pressure I should be running to the carb. It was set at 2.5, but adjusting it doesn't seem to make a difference at all, but that could be because the pump is dying.

So considering a stock pump runs for $140 at autozone, and the guy at autozone saw it and said "screw that, go get yourself something aftermarket" this may be a decent set up for me. Unfortunately, this being my first car with a carb, I know jack about the fuel set ups so I'm not sure what I really need to do, so any help would be appreciated.

Thanks folks.

mar3

iTrader: (8)

I know I'm going to get roasted, but I can't help myself. If you're ready for a fuel pump that's louder than even a modified exhaust, then get the Carter. If you want to spend the money once on a fuel pump and step up from old school rotary vane, solenoid or pump style fuel pumps, then get a Mallory gerotor-style fuel pump. The Comp110 will cover all fuel loads short of going EFI and is significantly quieter than the Carter. Don't follow the masses off the cliff....

riffraff

carters are definatly loud... but they are good. for the price, i donot think that you can beat it

if you want something quieter, you can always go for an intank pump..

82streetracer

iTrader: (1)

in the summit catalog is saw holley pump (75 gph) with matching 3.5 to 14 psi regulator for 95$. Thats what I plan to get when I get the Holley SP kit from racing beat.

cletus

I honestly don't care about how loud the pump is, the car isn't exactly quiet with whatever the exhaust system on there is. Before I changed the filter, I could hear it over the engine at like 3500. Now sometimes its quieter. I'm not sure what's on there though. I think it's dying, but I could be wrong.

hanman

510-12-804 Standard $ 22.99
This regulator with the Carter pump 180-P4070 Super Street Pump $ 53.99
works great with the Yaw carb setup. If you are running Webers or whatever I am not sure how this would work. It will work great with the stock Nikki carb also.
When you mount the pump (on the frame rail, right before the axle) use rubber cushions to help quiet down the pump.
Also, you will need a pressure gauge to set the regulator. This best one is from Paul Yaw @ Yawpower for $45.00.
This is my set up and it works great albeit a tad loud. ( I wasn't smart enough to put the rubber cushions in)
just my opinion, I could be wrong,
hanman

hanman

By the way, V8klr, the pump you are looking at is too high pressure. The key is high volume, low pressure.
hanman

V8kilr

the super street is the lowest psi pump they carry,besides recomended fuel pressure on a stock rx7 is 4.5-5.5 acording to haynes and chilton.

hanman

V8kilr,
Sorry, I looked at the wrong pump on your posting. We are talking about the same pump.
hanman

Sterling

Cletus-
I doubt your pump is damaged from the filter being clogged.
The stock pumps are fine for a stock carb set-up, but knife-edge marginal for any carb modifications. So I can't figure out why anyone would've installed a pressure regulator on your 12A carby; unless of course they also installed an after market pump as well. A stock pump simply does'nt need it.
This would certainly explain why it's so noisey.

V8kilr-
Get the Carter (like a lemming jumping from the cliff!) or whatever pump mar3 is suggesting...so long as it will push at least 7 psi.
I've read discussion about the Carter (only because it's a favorite flavor of the week), but what I've read I'm certain applies to all electric fuel pumps...
Applying my own interpertation; The instructions that come with the Carter says it's a 7 psi pump.
O.K. That's 7 psi at your elecrtrical systems absolute best!!! My pump is noisy as hell (because I'm lazy as hell, and did'nt install a piece of rubber between the frame and the pump), but when that thing is humming, and I put on my blinker, those little lights are sucking lots of juice from that pump! It oscilates with the blinker lights!

My point is that you just need a pump that is slightly over your intake's needs to ensure that there will always be adequate delivery under all sorts of conditions. Headlights on? Hell; that might just be enough to reduce a 5 psi pump down to a 4.75 psi pump while those lights are on.
SeewaddImean?

So just pretend you already have that Camden on there, and get a pump that will handle delivery for that set-up...plus a little bit. Then regulate it down to your present needs.

Just exactly what that "little bit" is, I dunno. Maybe this summer, I'll measure the output of my Carter "7 pounder" @ 3K RPM, and then remeasure at the same RPMs with the radio blasting, headlights on, and heater (don't have AC)...window defroster...blinker- whatever. It'll be interesting.

This is not a dig at all on the Carter. I think they're all subject to what I've just described. But the package says "X" psi - it just means at optimum conditions.

The Carter is damn noisy, though. Did'nt bother me at first. Now it's just plain annoying!

****** GOOOOOD cooffee!
YEEEEEE-HAAAAA!!!!

cletus

Sterling, you were right. Talked to the former owner and it is a holley pump of some sort (he couldn't remember the model) that he said will put out somewhere near 9 psi. Guess that explains a lot. Also means I probably don't need a new pump right now.

Sterling

You don't describe well the regulator. It sounds like you may have a crappy one. I run a Holley 4 psi regulator as per Paul Yaws instruction. It works great, though I can't see the fluctuation of my fuel pressure gauge while driving (it's under the hood; not on the console like I would like...yet).

There has been some 'hemming n' hawing' about the usual other choice regulator not working very well. I think it's made by Purolator BUT I DON'T KNOW! It's round (I believe)...You'll have to do a search and it will be time consuming. Perhaps just better to post the specific question in itself. (Rate the thread so it goes in the archives if you get alot of info.)
Point is that your regulator could be ******* you all up but your pump could be fine.
**I've never used any other regulator, so I have nothing but what I've read to atest to.
Very likely, (I would imagine) if a regulator were "crappy", then it probably does'nt have the consistancy under naturally occurring fuel pressure fluctuations that you encounter just driving. (Even the best pump will fluxuate its output a little bit)
The other thing I'm willing to bet on is that the numbers you describe are not calibrated very well on the regulator. They're probably cast into place on the housing, and I doubt that the good folks that assemble them calibrate every single one by tempering the spring inside!
That's just the nature of mass production...no two springs will ever be exactly the same; nor will cast parts ever fit perfectly together. They need springs, and need to be cast in order to be affordably mass produced. It does NOT mean they are bad quality. Any good measuring insrument manufacturer will tell you that you can't 'pre-calibrate' a measuring device before it's cast!

All that being said, the numbers could simply be there for reference purposes; not actually indicating "PSI" quantification. (Or they could be printed on a calibratable dial for all I know!)

For your stock carb, you need the bigger hose going to the carb (fuel line in; the smaller is the return line) to be putting out a pressure at least 3.5, but no more than 4.7 psi.
You need a pressure gauge obviously to test it. But perhaps you can get a sense of whether or not your fuel is being properly regulated by just doing a volume test. You should have between 1100 cc and 1400 cc of fuel come out after exactly one minute.

These numbers are "there-about" numbers, as the specs change from year to year though the components did not. But you'll know you have a problem if you're filling a gallon jug after one minute!

(I do suspect you're getting too much fuel.)

T-Rav

To show my ignorance of fuel pumps... I have read on the forum that that GSL-SE, because it is fuel injected, has a fuel pump that runs at a much higher pressure than a carb'ed engine. Would you recommend an aftermarked FP and regulator for the SE? I've read many a post that says the FP is one of the best upgrades for the 7. Is this so for the SE or only carb'ed engines? What would you recommend? Thanks for the help!

BadAssRX-7

the -se pumps are WAY to much presure for a carb they are 50+ psi