Custom Plumbing for FI and carb question

[brads70]

Looking at options for plumbing and electric fuel pump. For now I will be running a carb and a
Mallory Comp 140 pump and regulator. Planning on a return line also. Down the road I am thinking about a Fast FI system. What I'm wondering is with the alcohol in the fuel these days would teflon lined braided stainless lines be better than the old rubber stainless lines?
 Figured it would be better to use someting I can use for both carb and higher pressure FI and only plumb once. Any words of wisdom?  Looking at this?
http://www.holley.com/EarlsCatalog/Catalog.asp?pageNumber=25
http://www.holley.com/600006ERL.asp

[hemiken]

Hey Brad,

Are you thinking of using this from front to back buddy ?

If you are about to say yes, i would abort the whole idea old mate.

What you want to do is make and bend your own hard line from front to back, use 1/2" as the main feed line to the front, it is not hard and it is a better solution for something you want to last for ever and it is much tidier and it looks so much better, and in the long run, it is much lighter in weight also.................

[Chryco Psycho]

I would go to a hose MFG & get what they recommend for ethanol fuel blends , you can run a braided line front to back & still pass tech at the track & as long as it is secured properly you will have no issues , the hard line is a good idea as well . Isn't the Fast system a throttle body injection unit ?

[brads70]

Thanks for the reply guys! Ya I was thinking of running it front to back. Tell me more about working with the hard line? I've bent up brake lines with the proper tool. What tool will I need to bend up the 1/2" line you suggested Kenny? Why do you not suggest  using it front to back?
That's exactly the reason I was looking at the teflon lines hose rather than the rubber stuff.( ethanol eats the rubber)
Neil FAST has both styles, I was looking at the individual injector styles/types to use in the STR manifold and it uses a dry carb without fuel bowls looking kind of a thing that mounts were the carb goes. Just to monitor air and it has a TPS built into it as well. Lots to learn ( for me)... my head is spinning!
 http://www.compperformancegroupstores.com/store/merchant.mvc?Store_Code=FS&Screen=PROD&Product_Code=307603&Category_Code=4150Style

[Chryco Psycho]

Accufab has a extremely thin Throttle body approx 1.25 inched thick & flows 1200 CFM , no fule bowl needed with EFI , just the throttle body with idle speed & TPS the fuel is entirely controlled with a MSD / Poreche / Bosch fuel pressure reg & the injectors them selves , I used 70 lb / hr & made over 700 gross HP

[brads70]

Accufab has a extremely thin Throttle body approx 1.25 inched thick & flows 1200 CFM , no fule bowl needed with EFI , just the throttle body with idle speed & TPS the fuel is entirely controlled with a MSD / Poreche / Bosch fuel pressure reg & the injectors them selves , I used 70 lb / hr & made over 700 gross HP

Looks like Fast and Accufab use the same throttle body, they just put there names on them. Wonder who makes the part originally. Accufab seems to be cheaper! Check out the tiny injectors available, I was thinking the smaller injectors might fit in the STR manifold better? What I don,t know is what kind of spray pattern they have. I,m thinking I,ll just put the STR on the shelf for a year or so and do some research and learning first.
http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=PROD&Store_Code=FS&Product_Code=30462_1_4_6_8&Category_Code=GMGenIV

[HP2]

Brad,

I'm taking a similar approach with mine, only I'm targeting E85 usage. I'm using Aeroflex teflon braided hose from the tank to pump, which is around 3" worth of line. After that, I'm running 3/8 aluminum line to the front of the car. I'm running this along side the factory 5/16 line and will utilize the 5/16 as a return line that will plumb in to the vent asembly next to my sending unit. Teflon hose will then make the connection from the regulator to the carb, maybe 12" worth.

This is the foundation for a later EFI change over that will only require a change to the high pressure pump and efi set up.

Tony

[brads70]

Brad,

I'm taking a similar approach with mine, only I'm targeting E85 usage. I'm using Aeroflex teflon braided hose from the tank to pump, which is around 3" worth of line. After that, I'm running 3/8 aluminum line to the front of the car. I'm running this along side the factory 5/16 line and will utilize the 5/16 as a return line that will plumb in to the vent asembly next to my sending unit. Teflon hose will then make the connection from the regulator to the carb, maybe 12" worth.

This is the foundation for a later EFI change over that will only require a change to the high pressure pump and t efi set up.

Tony

Ya does sound like we are "on the same page" Do you have a link to the fuel line you used? I googled I can,t find anything?

[Chryco Psycho]

I ran two 3/8 steel lines to the front off a manifold in the rear , use a pair of the Walbro inline pumps , [very quiet !!] & tied each line into a rail for 4 injectors then teed the return & ran a 3rd line back to the tank. 

[brads70]

I ran two 3/8 steel lines to the front off a manifold in the rear , use a pair of the Walbro inline pumps , [very quiet !!] & tied each line into a rail for 4 injectors then teed the return & ran a 3rd line back to the tank.

Why 2 pumps? Sounds expencive?

Just googled Walbro inline pumps and they are not that expencive!  But why 2?

[Chryco Psycho]

3 reasons ,1- the pumps are not expensive & 2 costs less than 1 big one
2- the pumps do not flow enough fuel to supply 700 hp on their own
3- did I mention they are very quiet

[brads70]

3 reasons ,1- the pumps are not expensive & 2 costs less than 1 big one
2- the pumps do not flow enough fuel to supply 700 hp on their own
3- did I mention they are very quiet

Ya quiet is good!  How do I figure out what size/supply I need? Add up all the  flow rates of the injectors and find a pump(s) to suit? (My new engine will be no where near 700 HP  ) So say you need 42lb/hr injectors how do you convert that to  what size pump you need?  42X8= 336 LBS/hr...?  pumps are listed by LPH ?(255LPH)  so how do I convert that?

[Chryco Psycho]

255 lt works out to 10 gal / minute so figure 2 gal in 12 seconds / 1/4 mile pass which is about right @ WOT , 1 pump would not be enough fuel

[HP2]

Ya does sound like we are "on the same page" Do you have a link to the fuel line you used? I googled I can,t find anything?

I picked it up from Summit. Search Aeroquip TFE AN hose. They have -3 to -8 in lengths from 3 feet to 20 feet.

3 reasons ,1- the pumps are not expensive & 2 costs less than 1 big one
2- the pumps do not flow enough fuel to supply 700 hp on their own
3- did I mention they are very quiet

Quiet is good. I may go check these out. Thanks for the tip!

[brads70]

Thanks guys!