using electric fuel pump in place of mechanical pump

68notch Casual Dubber

32 posts · joined May 2003 · 11 Dec 2004, 7:35 pm

#278358

Hi guys,
I have a suspect stock fuel pump in my Notchback that I want to replace with an electric one.
On the shelf I have a mazda electric fuel pump that I know works. Can I just wire it up and connect it in place of the stock mechanical pump or do I need to resort to extreme measures to use it?
I am running twin solexes and I have a blockoff plate already to plug the hole in the case so just wondering does this pump require a return line and/or regulator? Will the needle and seat in the carbs regulate fuel pressure and flow?
I have no idea so help is greatly appreciated regarding making the switch!
Regards,
JT

68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 · 11 Dec 2004, 9:45 pm

#278414

Hi JT....

The best place to put the electric fuel pump is under the fuel tank... and just wire it to the ignition circuit... if You add a switch somewhere.. it doubles as an anti-steal switch....
The pressure from electric pumps into the carburetors can be too high for the needle & seat.... so You will probably need a fuel pressure regulator....
I did with Mine.... the engine flooded, so I switched the pump off for a few seconds and the engine came good..... I have now fitted a Holley adjustable fuel pressure regulator... in the engine compartment before the fuel goes to the carby..

See how You go...

Just take everything out of the old fuel pump hole....
and block it off with a plate + gasket or silastic....

My Son runs an electric pump in the engine bay in His Baja....
and a holley fuel pressure adjuster with Holley Bugspray carby.... Your Mazda pump may be regulated already??

Lee

- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---

Oasis Going alone...

1,806 posts · joined Jul 2003 · 12 Dec 2004, 1:40 am

#278463

Only use a Malpassy fuel pressure regulator. Different carbies like different amounts of pressure. Read www.lowbugget.com for Kadrons. Only what I've read and been told...

"Tell him 'We've already got one'"

BiX Veteran Volks Folk

2,499 posts · joined Sep 2002 · 14 Dec 2004, 8:22 am

#279505

is the mazda pump a from a fuel injected engine or a carby engine?

I have no sympathy for my car, only the wallet that pays for it!
Go hard or go home!!!!

68notch Casual Dubber

32 posts · joined May 2003 · 14 Dec 2004, 2:36 pm

#279617

Thanks for all your help guys.
The mazda pump is from a 929 carby model. Unfortunately it had seized after sitting for a couple of years and no amount of dismantling and cleaning out the crud could make it operate reliably so I'm back to square one. :jesus
After reading another post by dannyboy67 it looks like he's got it sorted so at least now I know what I'm up for and pretty much how and where to fit one.

I'll post in the tech talk section a question regarding the problem that lead me to wanting to go electric in the first place.

Thanks again!
JT

68notch Casual Dubber

32 posts · joined May 2003 · 15 Dec 2004, 6:04 pm

#280149

Hey 68Auto, how did you regulate the fuel pressure?
I mean did you have to use a pressure gauge (like a T connection one) and just dial up the correct pressure on the regulator?
Also, what did you pay for your Holley one? I'm just after an idea of what the expense will be if you don't mind mentioning it 😉

Craig Paton Wolfsburg Wizard

620 posts · joined Apr 2004 · 15 Dec 2004, 8:08 pm

#280246

I have a Jaguar 6 cyl fuel pump that is self regulating and is quiet! I think it is a S.U. pump!

I believe these are sold from a business in Syd. Probably could contact some Pommy car clubs to find out more.

Cheers

68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 · 19 Dec 2004, 11:34 pm

#281818

Yes the Holley regulator I bought off ebay cost $70 and is adjusted with a screw driver...
It came with no details of how to adjust...
ie,, which way to turn the adjusting screw....

My Son bought a holley adjuster with a large metal knob on the top... looks better and is easy to adjust...
It is just in the fuel line before the carburetor...
Mine is mounted on the fan housing...
cost about the same I think... two years ago..

Lee

- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---

matara Custom Title Time!

1,342 posts · joined Aug 2002 · 20 Dec 2004, 8:42 am

#281887

What are the benefits of an electric pump over a stock pump in an otherwise stock motor?

Thanks

Steve