Mechanical fuel pump to dual quads compatability questions??

[Bass]

I'm trying to pick out a fuel pump for my new SBC that is going to use 2 Carter AFB 500cfm carbs, and I'm not exactly sure which pump to get. I want to keep a mechanical pump, and right now I'm looking at either a Carter or Summit pump.

Both pumps I'm looking at flow around 110-120 gph max, and 6-8 psi of pressure, but one has a 1/4" inlet, the other has 3/8".

First question is whether or not a 3/8" inlet is necessary, or if the stock 1/4" inlet will do? I've been using the stock size for a while now with no problems on a single 4bbl, but I don't want to starve out the pump with the added fuel the dual quads are going to need. So changing to 3/8" is possible if it's really necessary.

Second question: I think the 110 gph should be adequate flow since that's almost double the stock amount, but does anyone know what psi the Carter carbs should need? I think I've read they only need 3-4 psi, so with a fuel pressure regulator either of the pumps I'm looking at should be more than enough, correct?

Thoughts and opinions, anyone? Thanks in advance for any help!

-Brian

[50 Ford]

I know I could just call you and give my opinion on this but then you wouldn't have anything to read.
I would go with the one with the 3/8 fittings. you using 3/8 fuel line? anyway the bigger, the more volume, might not be necessary but it won't hurt http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif
I don't think you would need a regulator on those carbs with that pump either but that wouldn't hurt either for the dial in!

keven

[mr57]

Go get a fuel pump for a 425 horse 409. Same part number goes for a 348 in 58-9 2 1/2 ton trucks or bigger. This should flow all you need.

[Fat Hack]

My brother in law is using a stock 348 mechanical fuel pump (same as any basic small block Chevy) to feed two 660cfm center squirters on his car...seems to work fine thus far!

[FWilliams]

either one of those pumps will work fine, i have run the holley pump that fits those specs also. 360 cubic inch dual 660 center squirters, no problem on fuel starve on full pass. i did run a regulator

the 3/8 fitting is really a non issue unless you have a 3/8 fitting coming out of the fuel tank, most fuel tanks have 1/4 inch.



i havent run the carter but was sent one for the raffle engine, and really like the looks of it.

[hemi coupe]

Brian Bass, you should know by now if you are going to go, go big my friend. Think of how Curtis would do it. I say holley red electric pump. I have used one of those before and it worked killer. I would use the 3/8 line. I know that you are a little hard on your stuff and performance is important so go big.
love
Jimmy White

[flt-blk]

I should have an extra Holly pressure regulator in my box
of carb stuff if you want to use it.

Phil is putting my Edelbrock on the wagon so you better
watch out.
TZ

[Bass]

Thanks for the help guys.

Racefab, the only reason I've ruled out the similar Holley is because it is a little more expensive. Your opinion means a lot to me, thanks for sharing your experience and expertise.

Mr. James White, I"m going to try to subscribe to the "what's worth doing is worth overdoing" philosophy, but I need a little time to work it into my system. I personally like mechanical pumps, so the Holley Red pump is not going to happen this go round....but maybe on the Model A. Please tell Bob Brooks I said Hello and What the Fuck.

It is possible for me to change to 3/8" line without a lot of extra work (changing the gas tank is no big deal in this case), but I still haven't made up my mind.

So far I'm thinking keep the 1/4" line and go with the Carter...

Tyler, I don't think I'm going to have to worry about Phil...trust me on this one. http://www.jalopyjournal.com/ubbthreads/images/graemlins/wink.gif

[OutLaw]

Are we looking at another El Grudge match up?

[Tony]

On my 283 i used a Holley 'street' mechanical pump, regulator set at 4-5 lbs, 3/8 line and dual carter 500's on a Offy manifold.
NO problems at all.
In fact, i have a 6-71 huffer on the same motor, with the same fuel system and it's feeding that too without any problems. (just had to fatten it up a bit for the blower).

Tony.

[stangzilla]

you had better watch out for me dude
my stangs going to get you

[Bass]

I think my Grudge match will be with stangzilla. I hear that 'stang is bad to the bone...what's up?

I just realized that my Holley fuel pressure regulator has 3/8" inlet and outlets, so it looks like I might have to switch to 3/8" line unless I want to adapt it down.

Flt-blk, does the regulator you have have 3/8" inlet/outlets also?

[67Imp.Wagon]

Let me tell what Melba toast is packing.

[Bass]

Phil, you gotta get those pizza cutters off of there and get some real tires.

http://www.jalopyjournal.com/ubbthreads/images/graemlins/tongue.gif

[Anderson]

Watch out Big Ric...

[Bass]

Hahaha...here we go again! Nice work K&R...

I think I'll even leave my hood off and paint my firewall white! Gotta get the matchup as even as possible!

http://www.jalopyjournal.com/ubbthreads/images/graemlins/tongue.gif

[hemi coupe]

I want to be included in the grudge match, six 97's versus the dual quad guys, I am a little leary though, I know what kind of evil is going to be lurking under the hood of the Bass mobile.
see you in october
JImmy White

[SamIyam]

I'd run 3/8" line all the way back to the tank and in through the pick up. You'll have to modify the sendor, but at least you'll be sure that you won't have any fuel starvation problems.


The mechanical pumps should not need a regulator, but you might just put a gauge on it for shits and grins.

I think if it was pumping out much more than 120gph and 9psi, you'd need a regulator.

FWIW, I've run the Carter pumps on all of the 12 second street cars that I have had... without regulators, 3/8" fuel line... and they always performed flawlessly.
Sam.

[SamIyam]

If there is "evil" lurking underneath the hood... ya better send me a OM, you need a TOTALLY different fuel system for that shit. http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif

Sam.

[Bass]

Not that kind of evil, Sam...at least not yet. http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif

[du$ty]

im gonna say 1/4 just because 50ford said 3/8,,,but then again he is a just a "gearhead"...so he is most likely right. but on the up and up...bigger is better.but it doesnt really matter:D dont care who ya are.... 67imp...hemi coupe...bass....big ric.....all ya aint shit when hudson hawk...aka hudson kid pulls up....his car is boss.got three carbs and a sbc with autotrans and portawalls......drive it anywhere and he lives his life a 1/4 mile at a time.whats up???. http://www.jalopyjournal.com/ubbthreads/images/graemlins/shocked.gif http://www.jalopyjournal.com/ubbthreads/images/graemlins/laugh.gif

[Kool Kat]

Since I know so much... Y'all talkin' bout little girlie size fuel lines 3/8-1/4 http://www.jalopyjournal.com/ubbthreads/images/graemlins/ooo.gif. Fuck it! Go with 1/2" race line. Run a oem type electric pump on the frame 12- 18" from the tank. Kinda like a helper to the mechanical at the motor. Then let the mechanical work at pushin the fuel to the carbs. No starvation there daddyo!

Only listen to kartbreaker if ya want to blow up yer motor...well you already did that, didn't ya?

[flt-blk]

[ QUOTE ]
Flt-blk, does the regulator you have have 3/8"
inlet/outlets also?

[/ QUOTE ]

I'm pretty sure it does, I'll pull it out of the box
tonight and check.

When does the Bass-O-Matic 49 get it's new heart, need any
help?

TZ

[hankcash]

[ QUOTE ]
[ QUOTE ]
Flt-blk, does the regulator you have have 3/8"
inlet/outlets also?

[/ QUOTE ]

I'm pretty sure it does, I'll pull it out of the box
tonight and check.

When does the Bass-O-Matic 49 get it's new heart, need any
help?

TZ

[/ QUOTE ]

Heart transplant party???
HC

[BIG RIC]

I ain't scared!....But i think bass is gonna have the goods this year!

Jimmy, you bringin yer car?....Hope so, see ya soon.

Oh yea,....3/8" line all the way.

[du$ty]

http://www.jalopyjournal.com/ubbthreads/images/graemlins/shocked.gifoh man come on..."Only listen to kartbreaker if ya want to blow up yer motor"
yeah im the first one that ever did that...i also taught brian how to break transmissions.. http://www.jalopyjournal.com/ubbthreads/images/graemlins/confused.gif http://www.jalopyjournal.com/ubbthreads/images/graemlins/laugh.gif

[FWilliams]

if opening up the outlet at the tank is no big deal, then i would definetly run 3/8


i just see so many setups with great big fuel lines , big narly electric fuel pumps,and they all run back to a tank with a 1/4 inch fitting