fuel system questions

[mike_starling]

OK Guys,

Am laying out the fuel system and considering the parts to be used. Is for a 351W engine that dyno'd 506 fwhp.

Thought I'd try to acquire a Mallory pump and pressure regulator. I'd route hard line from the tanks to a "T" through a directional check valve on each side. Then to the pump with SS wrapped tubing and from the regulator to the carb fuel rail with the same.

A few questions:

1) Is copper a no-no for fuel hard line?

2) Swage-locs OK for compression fittings?

3) Anyone identify a source of reasonably prices check valves?

Any other insights on other things that should be in the circuit other than an inertial switch for the fuel pump?

Thanks,

 

[Bill Bayard]

Mike,

If there is a remote chance that you will be adding EFI at a later date, add returns, etc. now, and cap them off. Retrofitting them later is a BITCH!


Bill

 

[mike_starling]

Bill,

When I bought the tanks, I specified that they have returns for the very reason you mentioned. I will plumb and cap them.

Dismounting tanks is a pain in the ... even when they are empty. I REALLY don't want to do that when they've had fuel in them.

(Oh ... and yes they are cells containing Aero Tec foam.)

Thanks for the reminder.

 

[dave harris]

Hi Mike,

Instead of working with check valves (and potentially more in the future if you go injection) you might consider adding a switching valve to your system. The company is Polack (or Polock sp? I can get the info if you need it) and the vlave is not a solenoid, but motor driven. has 2 into one fuel source, and 1 into two fuel return internal to the valve. It will also switch fuel tank senders if you are only using one fuel gauge. I think that the cost was between $50 to $65.00 US and comes with the special switch to change back and fourth. The nice part is because it's not a solenoid, you drive the motor to one side and then it shuts off (so no ongoing heat source from the solenoid).

Anyway, just a thoght.

cheers

 

[Peter Olliviere]

Mike,
I agree with Dave, after much research I went with the Pollack valve. I used the 6 way unit that provides seperate feed and return lines per the three tanks used in the fuel system. Because of the seperate feeds there is no need for additional fuel control methods such as back flow valves, so in my mind the system is simpler. Some have expressed concern that the valve is only rated at 75LBS Max presure and has a plastic body but since it resides on the feed pump side it will never see that kind of pressure.

As for the wiring it is pretty simple. The switch works on reverse polarity, plus to negative in one direction dirves it to one side, reverse the polarity and it goes the other way. the reverse is controlled by a DPDT switch on the dash.

In my case the wiring was a little more diffacult because I had to intergrate the valve into the RF wiring setup for the LP pumps and the selinod valve that they use but overall I spent more time thinking about how to do it than it took to do.

Peter

 

Hi Guys, i'm not sure if this is the right place for this but i found it locally while searching for way of removing the AFM on my Toyota 1uzfe, and thought it may be of use to someone out there as it would appear to suit most engine types, http://www.performancemotorresearch.co.nz/

Regards
GraemeS

 

[Ian Anderson]

Please could someone give me details of where to get the Pollack Valves

Done various searches and ended up on some very strange sites!

Thanks
Ian

 

[Scott McDill]

Ian,
http://www2.catalognavigator.com/pollak/category/fuel-tank-selector-valves

Don' think they do retail sales though. For a decent price with connector and switch.

http://www.jcwhitney.com/webapp/wcs/stor...catalogId=10101

Also found this site with a unique EFI fuel filter/acumulator. Looks like they take a standard spin on mount, add a pickup tube, and an extra fitting for return. I was going to copy it and make my own but the price for parts would be about the same. They also have the valves.
http://bcbroncos.com
Go to fuel syestem then scroll down to the bottom of the page

also:
http://bcbroncos.com/store/index.php?cPath=27_51_108
http://www.bcbroncos.com/fuelsystem.pdf

(I am not affiliated with any vendors)

 

[Peter Olliviere]

Ian,
I purchased my Pollack 6 port fuel tank selector valve from J.C. Whitney. The part number is 812705 and the price was US53.95.

If you look at the builders section under RF Chassie #90 you can see apicture of the valve installed.

Peter

 

[Brett James-McCall]

Ian,
Looks the same as Europa do here: https://secure.visav.co.uk/avshop/products.asp?getcats=true&cat=32&scat=75

however, with JC Whitney only doing it for $54 instead of £90.80 after VAT, I know where I'd be buying /ubbthreads/images/graemlins/blush.gif

Brett

 

[Ian Anderson]

Scott, Peter & Brett

Many thanks for the information I'll place the order with
JC Whitney

Thank again
Ian