Plumbing for Ethanol

[LostMy65]

Here is an interesting document
https://www.google.com/url?sa=t&sour...=1585421961491

[LostMy65]

This thread has been focusing on the materials to use, but I have recently learned some more stuff about how to plumb for fuel with ethanol in it.
Many of you probably already know much of this, but it was new to me, and so I like keeping topics consolidated rather than having information scattered over several threads.
.
I've learned that even 10% ethanol fuel is more sensitive to heat than the fuel from the good ol days.
.
I'm seeing people running return lines for even carburetors. The goal is to try and keep the fuel from getting too hot - as it may be more likely to do in a 'dead-head' system.
.
When I plumbed for my Edelbrock, the recommendation was to get a fuel pressure regulator and keep the fuel pressure below 6psi.
I'm reading now that the regulator should be a bypass regulator that routes the excess fuel pushed from the pump back to the tank. Infact, some are saying to use a 12psi or higher fuel pump to keep the fuel moving faster through the system.
Plumb the bypass regulator as close to the carb as possible.
.
More to come...

[Captainfab]

Thanks for the update.

[lutronjim]

Interesting in lostmy65's post link https://www.google.com/url?sa=t&sour...=1585421961491 that PTFE and nylon are not listed.

[LostMy65]

I can't get the link to open anymore.
But I think I remember it talked about how ethanol corroded or deteriorated certain materials.
Maybe nylon and PTFE aren't mentioned because they don't corrode or deteriorate with ethanol. But it is odd they weren't included.

[richards72chevy]

Originally Posted by LostMy65

This thread has been focusing on the materials to use, but I have recently learned some more stuff about how to plumb for fuel with ethanol in it.
Many of you probably already know much of this, but it was new to me, and so I like keeping topics consolidated rather than having information scattered over several threads.
.
I've learned that even 10% ethanol fuel is more sensitive to heat than the fuel from the good ol days.
.
I'm seeing people running return lines for even carburetors. The goal is to try and keep the fuel from getting too hot - as it may be more likely to do in a 'dead-head' system.
.
When I plumbed for my Edelbrock, the recommendation was to get a fuel pressure regulator and keep the fuel pressure below 6psi.
I'm reading now that the regulator should be a bypass regulator that routes the excess fuel pushed from the pump back to the tank. Infact, some are saying to use a 12psi or higher fuel pump to keep the fuel moving faster through the system.
Plumb the bypass regulator as close to the carb as possible.
.
More to come...

Would a cool can that cools the fuel before it goes into the carb work?

[LostMy65]

Originally Posted by richards72chevy

Would a cool can that cools the fuel before it goes into the carb work?

I saw mentions of that in my search.

[Greasey Harley]

Originally Posted by LostMy65

...I've learned that even 10% ethanol fuel is more sensitive to heat than the fuel from the good ol days.
.
I'm seeing people running return lines for even carburetors. The goal is to try and keep the fuel from getting too hot - as it may be more likely to do in a 'dead-head' system.
.
...I'm reading now that the regulator should be a bypass regulator that routes the excess fuel pushed from the pump back to the tank. Infact, some are saying to use a 12psi or higher fuel pump to keep the fuel moving faster through the system.
Plumb the bypass regulator as close to the carb as possible.
.
More to come...

I installed a WIX WIX 33040 Fuel Filter with a return line on my K10.
I don't know if it needed it but it was easy enough to install and only cost a few bucks.
That truck burns 91 octane 10% ethanol, it has a Q-Jet so it doesn't need a regulator.

[vince1]

I was going to go for a walk this morning and then I smell gas and see a stain on the pavement. The rubber line to the fuel pump decided to not hold fuel anymore. With the tank between the frame rails and pointing the truck uphill the dripping stopped.

It must have gotten eaten up by the ethanol and the line was not that old. Thanks for the link on what product to buy.