Wiring Harness for Carb Setups

Ron Earp · 09-27-03, 12:10 PM

Hey,

Does RF produce a wiring harnesses specifically for carb setups? There isn't a lot needed, but I've got a fair amount of connections and materials on the standard loom that I do not need.

R

Robert Logan · 09-27-03, 08:40 PM

Ron,

Your wiring loom included all needed for the injection. This was not always used and is now included when an injection system is ordered.

I will forward connection details for carby's to you (what pumps are you using).

Best wishes,

Robert

Ron Earp · 09-27-03, 09:48 PM

The pump system will be a simple two Holley blue affair. One pump for each tank, plumped into the same carb feed, with anti-backflow valves installed after each pump so that the pumps do not end up pumping fuel from one tank to the other. There are no returns to the tanks, not needed for Webers, and fuel regulation is done with a single regulator before the carb banks. Fuel pressure is measured between the carbs with an analog gauge.

3/8" in fuel line with frame clamps every four inches and double clamps on every connection handles moving the fuel around. If the Holley's go bad then they'll be replaced with Carters. Carters seem to be more reliable over the long haul. I was using some of the large bowl and replaceable element fuel filters but got rid of them - they were more for looks than anything else. I like the looks but "chrome don't get ya home" as they say. Space is at a premium so they were junked for smaller inline disposalble filters. Now I don't have to worry about where to put the bowl type filters and it drastically cut down on plumbing.

R

Robert Logan · 09-28-03, 03:09 AM

Ron,

Easy mate, will send details tommorow by fax.

Best wishes,

Robert

Ron Earp · 09-28-03, 06:10 AM

Hey Robert,

Don't take any offense at what I wrote, I was just shooting you complete details of what I'm using and allowing others to take a look as well. I've drawn a few fuel schemes up and this one seemed rather simple and effective. I was hoping that others would chime in with whatever they're using too as I'm not sure what is best.

The stuff you supplied for the carb setup was fine, the only things I added to it were the bowl type filters which I really think I made a mistake in purchasing. They're hard to fit, space is tight, they don't filter fuel any better than other types, and they cost a pretty penny. As for Holley blues, well, they sort of have a bad rep locally for failing in vibration prone enviroments. Mine are well isolated and they'll do fine for the use I plan for them.

Part of why I asked a couple of weeks ago if folks were using good old mechanical pumps on their 40s and I got a few responses via email about using them.

Ron

Robert Logan · 09-28-03, 09:12 AM

Ron,

I would recommend you use Facet "red dot" fuel pumps. They are available through "Deemon Tweeks" in the UK and they will have a web site. Our V8 Touring Cars (Supercars) use them as transfer pumps from the main tank to the injection tank and a LOT of the folk in the UK use this pump in exactly the application you are looking at.

Mate, no offence taken. I could NEVER take offence at anything you would say. You are just so dedicated to GT40's and so level headed with your comments I respect your opinion. Big rap, but you deserve it !!!!!!

Best wishes,

Robert

Chris Melia · 09-28-03, 10:39 AM

Hi Ron

I used a Holley blue top pump on my MK111, I had to mount it on rubber to reduce vibration and noise. I have had no trouble with this set up at all, I note that the Holley blue top pumps 3 times the fuel of the Facet pump and also some guys in the UK have had problems with Facet pumps mounting them vertically because I understand they are designed to be mounted horizontally.
I also agree the glass fuel filters are old hat and I also went for the inline filter, I found that after the initial shake down runs it is wise to check these filters as an awful lot of debris finds its way into the Fuel system during construction.
When running twin pumps it is wise to always use one way check valves as you rightly say
regards
Chris.

Brett James-McCall · 09-28-03, 02:40 PM

Hey Ron,
If you need this stuff, people with the club get 10% discount at Demon Tweeks, so you could send Paypal and then you could get a no-tax present sent [img]/ubbthreads/images/graemlins/wink.gif[/img]

Brett

Mike Dozier · 09-28-03, 04:29 PM

Ron

Which check valves are you using and where did you source
them? Sounds like a good idea.

MikeD

Ron Earp · 09-28-03, 08:04 PM

I sourced the valves from McMaster Carr, www.mcmaster.com. You'll find them under backflow valves if I remember. They open at 1.2 PSI and resist flow up to like 150 PSI. They are all brass and steel, no plastic pieces so they should be fine. I threaded barb fittings into them and double SS hose clamped the fuel line on the barb. I think they were like $10 each, much cheaper than what you find at a Race supply store and exactly the same as what I saw locally at a speed shop, just $41 less.

R