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Fuel Pumps & regulators with Webers

Started by _jklumpp_ , Sep 03 2010 10:59 AM

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14 replies to this topic

#1 _jklumpp_

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Posted 03 September 2010 - 10:59 AM

I'm running triple 45DCOE webers on the holden 6, and I have been using the commodore style (flat top) mechanical pump, with the dial type Redline adjustable regulator.
I just had another regularor diaghram break on me on the weekend at Eastern Creek - it is the second one I have gone through of this style of regulator, and this one only lasted just over 12 months....

So I've been looking for a new regulator, and specifically at the Malpassi Filter King (filter & regulator), or Petrol King (regulator only) type, which seem to be the goods....

On one US weber site I read they recomend a Carter 4070 electric pump, which "does not & should not need a regulator" as it is quoted as 4psi, and 72gal/hr...
The cost of the carter pump is not much more than the regulator, so now I'm wondering if I would be better to replace the mech pump with an elec, instead of replacing the regualtor again, and possibly having the same problem down the track....?

Thoughts/comments/experiences?

P.S. the car is used for Road & track (supersprints)

Edited by jklumpp, 03 September 2010 - 11:00 AM.

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#2 _rocket_

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Posted 03 September 2010 - 11:54 AM

Talk to Bruce Dummett at nambour radiators Qld.

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#3 76lxhatch

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Posted 03 September 2010 - 12:25 PM

On one US weber site I read they recomend a Carter 4070 electric pump, which "does not & should not need a regulator" as it is quoted as 4psi, and 72gal/hr...

I think that's the one I'm using in my hatch to feed the 308 and Quadrajet. I picked it for the low pressure (I thought it was 5psi but) so I could use it without a regulator and it wouldn't flood the Quaddie. Has worked fine for some time now, and completely fixed the typical fuel starvation issues that the standard pump and small fuel bowl cause - I couldn't even get halfway down the quarter without running out before!

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#4 _LXATIV_

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Posted 03 September 2010 - 01:53 PM

Im using the carter 4070 on a tripple webered 265 hemi and im still using a regulator. Every one i know whos runs this pump is also using a reg, hence why i am too

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#5 greens nice

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Posted 03 September 2010 - 11:45 PM

i run a carter gold (dont know the number sorry) and redline reg and havent had any drama's with it.
the carter will flow enough for an off guts 6 cyl holden but not on alcohol, although a holley red or blue or mallory reg wouldnt go astray.
the carter pumps IMO are great for what most of us are doing.

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#6 orangeLJ

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Posted 07 September 2010 - 12:34 PM

Im running a holley red and holley 1-4psi regulator on the Purple car,

And now running a std glass top fuel pump and the same holley regulator (can get you a part number if you want) on the orange 4 door too. (triple 40s)

Its a nice little chrome unit, 2 outlets (gauge in one, outlet on other) one inlet, simply grub screw adjuster.

Cant comment on longevity, but I only payed $40 for the regulator (HPW in sydney) and it hasnt had a drama so far (about a month)

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#7 _82911_

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Posted 08 September 2010 - 07:53 PM

A good bypass reulator is the ticket here. Malpassi make a decent low pressure bypass reg.
I wouldn't trust that the pump can accurately regulate fuel pressure when it is traditionaly mounted a good distance from the carbs.
If the pump is mounted in the rear and regulated to 4 psi, you could have as little as 2 psi @ the carbs. Ok it won't flood at idle and will run ok on the dyno.... but as soon as you apply some longitudinal g forces to it at the track, you will have zero fuel pressure at the carbs. you will need sufficient fuel pressure aT THE REAR OF THE CAR TO OVERCOME THE FORCES OF GRAVITY THAT ACT ON THE WEIGHT OF THE COLUMN OF FUEL ..... FKN CAPS...,. GRRRRRR......forcing the fuel to actually flow backwards if the weight is greater than the pressurebeing applied.

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#8 GTR469

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Posted 09 September 2010 - 12:33 AM

Sorry for the thread steal but great looking car Greg :spoton:

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#9 Stinga

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Posted 09 September 2010 - 11:10 AM

maybe i havent looked hard enough, but ive never seen any decent brand regs that go down that low in pressure to the 3 or 4 psi needed for the webers, apart from the holley/redline ones

looked a little harder Posted Image

would something like this do the trick
http://www.rocketind...partno=ARO13202

Edited by MCH11N, 09 September 2010 - 11:16 AM.

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#10 orangeLJ

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Posted 09 September 2010 - 12:11 PM

So if the regulator is mounted in the front of the car, and the pump in the rear, the same theory applies??

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#11 _82911_

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Posted 09 September 2010 - 09:05 PM

Yes... a higher pressure is needed to overcome the forces of gravity under acceleration. This pressure can then be cut to the desired range once the fuel is at the front of the car. Smarter people mount the reg in front of the carb to help with this.
This is not a new thing..... Most early drag cars had the fuel tank mounted infront of the engine to assist with this, as well as the side benefit of weight biasing.

Thanks GTR :burnout:

Now I just have to put some miles on it.

Cheers Greg..

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#12 orangeLJ

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Posted 10 September 2010 - 11:52 AM

Thanks for that Greg.

Is that the same Walky that was in your old shed on stands?

definitely looks great!

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#13 _82911_

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Posted 10 September 2010 - 07:50 PM

Yep that's her

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#14 _jklumpp_

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Posted 11 September 2010 - 07:28 AM

This is the regulator I was looking at getting: Malpassi Filter King
And this is the Carter Pump Carter P4070

I have the regulator attached to the splitter block, on the side guard next to the carbs, with a pressure gauge between.
At the moment I just have the mech pump straight into the gauge (since the reg failed) and the pump seems to be putting out a contstant 4psi, regardless of revs.... So I'm wondering if/why I need a reg at all? I have had to drive the car a bit without the reg, and have had no issues....?

When watching the fuel pressure gauge, it does 'pulse' occasionally, & I think that may be what is killing the regs.... Don't really want to go and get a more expensive reg, only to find out that I still have the same prob....

I guess when I finally get the car on the dyno, I may find out if there is any fuel feed problems, but I would have thought it would have been obvious at Eastern Creek (with the long straight & high speeds) if there was any issue?

...I'm so confused now, I don't really know what to do...

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#15 76lxhatch

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Posted 11 September 2010 - 10:44 AM

Interesting that page states the pump shouldn't be used with a regulator... I'd be inclined to give it a reasonably thorough test and see if it works OK without one