How to: Vapor Return Lines in fuel tanks
Posted: Wed Nov 30, 2005 5:54 pm
Hi All, I am putting this together for several reasons.
1) I haven't found anyplace on the web where someone assembled a "How To" in a place that is open to commentary and allows us to work collaboratively.
2) I have been asked by a few people now to do this.
3) I am an educator and I like helping people out, even if I am wrong!
I am not saying that my method is right! By all means no! It may not be, but I am willing to stake my life on it! You may stake yours on it too?
First, what is vaor return? I understand it to be the excess fuel that is delivered to the firewall forward area when the throttle is pulled back after a high flow situation. There is also a certain amount of fuel residing there at all times, even when you have pulled mixture to idle cutoff.
The EFI system sends this fuel back to the tanks for recycling.
Some peole have reintroduced this fuel/vapor mix back into the fuel feed line just after the tank selector valve with good results. I chose to return it back to the tank for cooling and mixing with the bulk supply.
Others have just dumped it overboard. I personally have cost, environmental and safety concerns with this method.
The Eci EFI system (which is't yet available) and the auto conversions need a Vapor Return (VR) system to work properly.
Eci had a nice .pdf outlining the components of their fuelie system, but I cannot seem to locate it right now. If anyone has a copy of it, please let me know. We can post it here.
In addition to the extra work of the VR lines you will need a duplex fuel selector from Andair like this one:
I have noticed that no one seems to be giving these away at halloween or for Christmas near me, so be prepared... they are the better part of $600!
With cost not being an object, this shouldn't be a problem!
Anywhooooo, you will need to get some additional 1/8" elbows for this job. I installed mine like this:
...so they would clear the capacitive sender plates.
The bottom one is for the VR line. This is what it looks like from the inside:
You can see the nipples sticking into the first bay. (hahaha, I said NIPPLES! Sophomoric humor, I am good for that!)
I saved the root rib for last, so I could insert the tubes into position, rivet the rib and then tighen the fittings... in that order.
This is the view of the left hand tank, second rib as the tubes pass through the rib. I kept the vent line OEM and ran the VR just below and to the rear of it. The flop tube is totally clear of it.
... through the next bay:
...and the next one too, until it reaches the center of the tank:
...where I abruptly end it. Here it will dump into the center of the bulk supply for mixing and shouldn't affect the total capacitance read by the senders, as it should have minimal effect on the dielectric of the total quantity.
What do you guys think? Did I do OK? Anything to add?
I threw the poll on here for $h!+$ and giggles!
I am happy with the product! Hopefully it won't leak!!!
CJ
1) I haven't found anyplace on the web where someone assembled a "How To" in a place that is open to commentary and allows us to work collaboratively.
2) I have been asked by a few people now to do this.
3) I am an educator and I like helping people out, even if I am wrong!
I am not saying that my method is right! By all means no! It may not be, but I am willing to stake my life on it! You may stake yours on it too?
First, what is vaor return? I understand it to be the excess fuel that is delivered to the firewall forward area when the throttle is pulled back after a high flow situation. There is also a certain amount of fuel residing there at all times, even when you have pulled mixture to idle cutoff.
The EFI system sends this fuel back to the tanks for recycling.
Some peole have reintroduced this fuel/vapor mix back into the fuel feed line just after the tank selector valve with good results. I chose to return it back to the tank for cooling and mixing with the bulk supply.
Others have just dumped it overboard. I personally have cost, environmental and safety concerns with this method.
The Eci EFI system (which is't yet available) and the auto conversions need a Vapor Return (VR) system to work properly.
Eci had a nice .pdf outlining the components of their fuelie system, but I cannot seem to locate it right now. If anyone has a copy of it, please let me know. We can post it here.
In addition to the extra work of the VR lines you will need a duplex fuel selector from Andair like this one:
I have noticed that no one seems to be giving these away at halloween or for Christmas near me, so be prepared... they are the better part of $600!
With cost not being an object, this shouldn't be a problem!
Anywhooooo, you will need to get some additional 1/8" elbows for this job. I installed mine like this:
...so they would clear the capacitive sender plates.The bottom one is for the VR line. This is what it looks like from the inside:
You can see the nipples sticking into the first bay. (hahaha, I said NIPPLES! Sophomoric humor, I am good for that!)
I saved the root rib for last, so I could insert the tubes into position, rivet the rib and then tighen the fittings... in that order.
This is the view of the left hand tank, second rib as the tubes pass through the rib. I kept the vent line OEM and ran the VR just below and to the rear of it. The flop tube is totally clear of it.
... through the next bay:
...and the next one too, until it reaches the center of the tank:
...where I abruptly end it. Here it will dump into the center of the bulk supply for mixing and shouldn't affect the total capacitance read by the senders, as it should have minimal effect on the dielectric of the total quantity.
What do you guys think? Did I do OK? Anything to add?
I threw the poll on here for $h!+$ and giggles!
I am happy with the product! Hopefully it won't leak!!!
CJ
CJ
CJ
CJ