Carbon Tank Fuel Fittings

dhumphrys

Hi All

Thanks for the answers to my previous thread, unfortunately I have more questions...

I'd like to understand what each of the carbon tank fuel fittings does, here's my assumptions:

(1) The 2 fittings that screw into the tank are the same, having a barb on the inside to connect the fuel hoses (from the pump on the feed side and back into the tank on the return side). They have a male quick-release connector on the outside. Both these fittings have shut-off valves that prevent fuel escaping when they are disconnected.

(2) The feed and return hoses on the throttle-bodies each have female quick-release fitting that attaches on a barb. The fitting on the feed side is straight-through, whereas the fitting on the return side has a non-return valve.

Are these assumptions correct? The only area where I think I could be wrong is that the non-return valve could be in the fitting that screws into the tank, not in the female quick-release fitting.

Another question: Does anyone know the pressure required to open the non-return valve?

Thanks in advance
Darren

Mr.R

I don't know for sure but would assume that the non return valve uses very little pressure to return the ball to it's seat, the gravity of the fuel should be enough to close it, so the spring only needs to be very lightweight.
If I'm correct (I'm 99.9% sure that I am here) it would take hardly any pressure to lift it from it's seat, otherwise it would be acting like a fuel regulator/boosting the pressure at the TB's.

Steve R

Jasper

dhumphrys wroteHi All Thanks for the answers to my previous thread, unfortunately I have more questions... I'd like to understand what each of the carbon tank fuel fittings does, here's my assumptions: (1) The 2 fittings that screw into the tank are the same, having a barb on the inside to connect the fuel hoses (from the pump on the feed side and back into the tank on the return side). They have a male quick-release connector on the outside. Both these fittings have shut-off valves that prevent fuel escaping when they are disconnected. (2) The feed and return hoses on the throttle-bodies each have female quick-release fitting that attaches on a barb. The fitting on the feed side is straight-through, whereas the fitting on the return side has a non-return valve. Are these assumptions correct? The only area where I think I could be wrong is that the non-return valve could be in the fitting that screws into the tank, not in the female quick-release fitting. Another question: Does anyone know the pressure required to open the non-return valve? Thanks in advance Darren

The non return valve is in the fitting within the tank,not in the QD female.

AJV

Darren - If you just want a setup that will work - don't forget you already have a non-return valve in your standard alloy tank. If you can't locate a carbon tank specific non-return valve. Make a straight through union fitting for your CF tank and fit the standard non-return valve in series with the union you have made.

Andy

griff851

Darren I used an adapter piece I had made up. Basically it is a 20mm outside male thread with a flat hex section on it, with a female threaded hole in the middle.. Into it I fitted 748 female fuel connectors (which are not cheap and a gas tapered thread). Then I put male quick disconnects on the fuel line. The reversion valve I took out of my old tank and mounted it on a bracket which I bolted to the TB rail.

Griff
Just to add to Steves comment. The reversion valves spring pressure acts with the fuel pressure regulator to to give the correct fuel pressure. You can up the fuel pressure by changing the reversion valves spring tension.

dhumphrys

Guys, thanks for the replies, I think I understand the setup now and I have a few options to investigate!

Cheers
Darren

Mr.R

griff851 wroteJust to add to Steves comment. The reversion valves spring pressure acts with the fuel pressure regulator to to give the correct fuel pressure. You can up the fuel pressure by changing the reversion valves spring tension.

But it's a lot easier to just wind in or out the allen scew on the adjustable fuel pressure regulator, (fitted to most 851/888's) if you temporarely fit a pressure gauge into the fuel line you can see what pressure you're dialling in.
This's what I did when I set up my fuel pressure for the 996PS cams and single injectors, I made up a 'T' piece of fuel line to clip into the QD line connectors with the other end of the 'T' connected to a pressure gauge.

Steve R

Jasper

dhumphrys wroteGuys, thanks for the replies, I think I understand the setup now and I have a few options to investigate! Cheers Darren

I may have some fittings that can help you!

dhumphrys

Hi Jasper

Any offer of parts available gratefully received!

Please PM me with anything you think might help.

Cheers
Darren

Jasper wroteI may have some fittings that can help you!

henk

So if i"m correct.

On one off these connectors you put a fuel line that comes from the fuel filter and on the other side a fuel line that comes from the degasser.

But do you just push the fuel lines on the connectors inside the tank or do you use a clamp as well to keep the fuel lines on the connectors?

Henk!!!