GrandSportC3

Ordered a RJS 5 Gallon fuel cell as also the -8 AN fuel line kit.

Once I'll get it, I'll convert my fuel system to #8 fuel lines to solve possible issues/future issue with fuel delivery.

OK, now here's my question:

The fuel cell has two -8 AN outlets and one -6 AN outliet for the overflow. Should I plug one of the -8 AN outlets or should I run a return line? Right now, I'm not running a return line and I don't know if I should?? So, can I just plug the 2nd port or would there be any issues..

Also, the -6 AN outlet on top, should I run a line to a overflow container?? If not, where else should I route that line?

Any help would be appreciated!

davidm_comp

I just got a 16 gallon summit fuel cell. I was planning on plugging one of the 8an fittings and using the other as supply, and using the 6an as the return line.

pef427

Hey Ollie
I used the Aeromotive pump and ran the 2 -8's into a y-block with a -10 forward thru the filters to the regulater. I then routed a -6 back as a return line. Here's a pic.
-Patrick

GrandSportC3

thanks!! So, did you route the return line into the 6 AN on top of the fuel cell? How is the return line set up at the carb. Is there really a advantage of running a return line?

pef427

Aeromotive recommended it. Something about keeping the fuel cooler and also eliminating vapor lock. Yes I ran the -6 return back to a bung in the top of the tank. The Aeromtive regulator I used has one port for incoming fuel with two ports for out-flow to the carb and one port for the return including a port for a fuel pressure gauge.
I used 2 -8's from the regulator to each end of the 1250 without a fuel log. Check their website.
-Patrick

GrandSportC3

hmmm.. if the return line goes back into the fuel tank, it would be a closed circuit and the fuel cell is supposed to be vented because the cap isn't vented..

pef427

So you're saying if you didn't run a return line the top port would be used as a vent???
Check with the tank manufacturer and see what is supposed to act as a vent in the system when the return fuel line port is used. With a high volume/pressure pump there is more need than ever for a return line.
-Patrick

GrandSportC3

Patrick, do you have any pictures of the return line setup at the carb/regulator?
I always thought that the overflow port on top is supposed to be routed to a overflow canister/catch can...
I'm still wondering about the fuel system not being vented with the return line in place.. My current '68 tank has a vented cap.... Don't know how later models are vented because they switched to non-vented caps later.

pef427

I don't have any but I will be working on the car tonight and can take a couple. Again, just make a call to Aeromotive tech line.
-P

GrandSportC3

OK, I got the fuel cell and there are no instructions

There's also some sponge like things the fuel cell.. I assume that I'll have to remove those, right?

74droptop

The sponge is inside of the cell correct? If so that is like baffle to keep the fuel from sloshing around DO NOT remove it.
Also I'm running a return line to the stock tank with a non vented cap no problems, and yes at your power level you need to run a return line per your pump/or tank requirements and it does help keep the fuel cooler and prevents vapor lock.

GrandSportC3

Thanks!!! I was just concerned that the sponge will suck up the fuel and not release it fast enough and the fuel cell will run dry...

BTW - any pics of a return line setup for the carb/pressure regulator would be appreciated!!

pef427

Will do today. I ran into issues last night but I will try to get those pics today.
-P

GrandSportC3

pef427

Hey O,
I had to do the family thing tonight and didn't work on the car. I plan to work on it all day tomorrow. Bare with me one more night. Sorry.
-P

GrandSportC3

Talked with a guy at the local speed shop and they told me that I either need a bypass pressure regulator or a bypsass fuel pump. Is this correct?

74droptop

Yes, what type pump are you using now, probably ok if you have an electric pump, buy a regulator and follow the directions that come with it, you should be fine. I would run a -10 or -8 to feed the carb and 2 sizes down for the return. Your carb is probably set up for -6 it's ok to run -6 from the regulator to the carb and then -10 or -8 from the tank to the regulator, if you run -10 then the return should be -8 ,if you run -8 to the regulator then the return should be -6.

pef427

The Aeromotive by-pass regulator I used can also be used for fuel injection. Nice unit.
-P

GrandSportC3

ok, if I'll need a different regulator, I won't run the return line for now... I can change out the regulator later and run the return line...

I have more questions. Will post them in a new thread to get more related answers.

Twin_Turbo

If your cell doesn't have some kind of vent on it you will need to add one, preferrably a discriminator valve.