Flex fuel parts

dzammit85 · Postby **dzammit85** » Sat Apr 08, 2017 9:10 am

Hi, I'm trying to get parts for my flex fuel setup, I've got the injectors already, just want to know about the fittings I need, and if there is any fuel hose that isn't e85 friendly that would need to be replaced.
So pretty much I've got id725's,
the flex sensor I'm getting is just a Gm one, same part number as the one on the flyin miata website
And then the quick connect fittings is what I'm unsure about, these are the ones I've found, https://m.summitracing.com/parts/rus-611203
Are these the correct fittings for the flex sensor
Also does the flex sensor go in before or after the fuel filter
Any help would be great
Thanks

Magpie · Postby **Magpie** » Sat Apr 08, 2017 9:39 am

Flex fuel sensor should go on the pressure side http://forums.haltech.com/viewtopic.php?p=46834#p46834

Do you have an E85 compatible fuel pump? You may need to upgrade the wiring to the pump.

Adjustable fuel pressure regulator? Make sure it can be rebuilt.

AN6 push on fittings/hose like Aeroflot 400 is E85 compatible. Make sure you specify it needs to be E85 compatible.

Take the opportunity to change the fuel filter and pump sock. Make sure you get the orientation of the sock correct!

The American should chip in with advice as well.

StanTheMan · Postby **StanTheMan** » Sat Apr 08, 2017 1:13 pm

hey Dzammit. do you have a link to the flex fuel sensor?

Ive just gone through all this. or in the middle of it. I haven't changed the sock on the fuel pump.

I used AN6 200 series stainless steel line from Raceworks Teflon I think its referred to as PTFE. about $71.00 for 3 meters.

sounds like you have a blower on your car.

dzammit85 · Postby **dzammit85** » Sat Apr 08, 2017 1:15 pm

I have read a lot about the nb8b fuel return line, though most of it is very mixed, some say it's worth it and others say it's not worth it unless your looking for huge horsepower, to get something like 200rwkw would it be beneficial for me to do this, while I'm there and doing half of the other stuff

dzammit85 · Postby **dzammit85** » Sat Apr 08, 2017 1:20 pm

StanTheMan wrote:hey Dzammit. do you have a link to the flex fuel sensor?

Ive just gone through all this. or in the middle of it. I haven't changed the sock on the fuel pump.

I used AN6 200 series stainless steel line from Raceworks Teflon I think its referred to as PTFE. about $71.00 for 3 meters.

sounds like you have a blower on your car.

Yeah here is the link for the flex sensor, https://m.summitracing.com/parts/nal-13577379

I'm just at the beginning, I've been uhming and ahhing about a flex setup for a while, but then I found the injectors for sale on here and couldn't resist, so now it's full speed ahead

StanTheMan · Postby **StanTheMan** » Sat Apr 08, 2017 7:00 pm

thanks for the link.

I just changes some more lines near the fuel filter today.

in all seriousness. My line are original 27 years old. they look fine on the inside. Ive only been running E85 for about 4 weeks. If you are trying to keep cost down....just keep an eye on them.Change them if yoyu feel the need later.

Of course if you like the bling like I do. Don't let me hold you back. stainless steel braided lines are nice.

Nitro Dann has preached about the necceceties of what is really required a bit.And he is right. But I don't regret doing the fuel lines.

But a conversion.....consists of an ECU & maybe a felx fuel sensor. 2-3 fuel filters & the socks for your fuel pump.

Nothing wrong with going all out though.

Ive found my stock NA6 injectors reaching 93.8%. Duty cycle. Could be that my VE table is a bit rich at the top But in running only very slightly lean at that point. but since you have them. I'm not sure whats going on with your car & what mods you have . But if you are installing those injectors on a close to stock car.....its serious overkill. You have some big injectors....but since you have them. may as well install. I assume you have an aftermarket ECU.

dzammit85 · Postby **dzammit85** » Sat Apr 08, 2017 11:38 pm

No worries about the link, I have actually read a fair bit of what Dann has said about flex set ups, not everything needs to be changed like what most people think, which brings me to my conclusion of just keeping it very simple, I don't want to spend more money in a fuel setup if it is not needed so this is the shopping list

DeatschWerks Electric Fuel Pump Installation Kit
DeatschWerks DW 200
13577379 - Chevrolet Performance Flex Fuel Sensor
Russell Push-On EFI Fitting

I will keep an eye on the fuel line, though I don't think I will be running e85 constantly, it is about a 20 minute drive for me to get it, so day to day will probably still be 98 octane, then if I do track days I will switch it too e85 for the extra gain, though I think them parts I've got will suffice for what I'm aiming for

StanTheMan · Postby **StanTheMan** » Sun Apr 09, 2017 6:13 am

don't forget about fuel filters.

Magpie · Postby **Magpie** » Sun Apr 09, 2017 6:34 am

Remember you will use up to 3x the E85 when compared to 98.

What fuel pressure regulator are you using?

dzammit85 · Postby **dzammit85** » Sun Apr 09, 2017 8:35 am

StanTheMan wrote:don't forget about fuel filters.

I've actually got a fuel filter sitting in the garage that I bought a few months back and never got around to changing, so for the initial install I should be fine, do I just need to change the fuel filter and sock after a tank or 2?

Magpie wrote:Remember you will use up to 3x the E85 when compared to 98.

What fuel pressure regulator are you using?

I'll just be using the stock one, I have read that they are perfectly fine to use, and in some cases better then an aftermarket regulator

Magpie · Postby **Magpie** » Sun Apr 09, 2017 9:10 am

Not if you are increasing the base fuel pressure from the tank. How are you going to check the fuel pressure?

I will dig out a bit of OEM fuel hose that has been running E85 for a few years and you can see/feel the difference between new and old hose.

You are flowing almost 3x the fuel hence there is a lot of extra demand on OEM stuff. Not many products are designed to function well above 100% of their duty cycle.

dzammit85 · Postby **dzammit85** » Sun Apr 09, 2017 11:42 am

Magpie wrote:Not if you are increasing the base fuel pressure from the tank. How are you going to check the fuel pressure?

I will dig out a bit of OEM fuel hose that has been running E85 for a few years and you can see/feel the difference between new and old hose.

You are flowing almost 3x the fuel hence there is a lot of extra demand on OEM stuff. Not many products are designed to function well above 100% of their duty cycle.

Ok, would you suggest running all new hose and a AFPR, also if I do that, do I get the same hose size which correct me if I'm wrong is 6an, or do I go one larger to allow for the extra fuel to flow through

dzammit85 · Postby **dzammit85** » Sun Apr 09, 2017 12:14 pm

If I were to do this I would most likely being doing something like the flyin miata big flex fuel kit, minus the dual feed fuel rail, Would this be a good route to go

Sorry another question, on the first comment you wrote with the link to flex sensor install, it says that it should be installed on the pressure side because the return is too late in the fuel line for the ecu to pick up the difference in ethanol content to adjust the fuel flow, though on flyin miatas website it says to run the flex sensor on the return, is this simply because of the position of there return, which is located next to the fuel filter

madjak · Postby **madjak** » Sun Apr 09, 2017 1:13 pm

I run mine on the return. I don't change fuel whilst the engine is running so I cant see any issues with it there instead of the pressure line. When I add new fuel I cycle the fuel pump whilst the engine is off until I read the new value. On my car it only takes a few seconds. I prefer as fewer connections on the pressure side as possible.