Please help me design a switchable fuel system
Honda-Tech Member
Joined: Dec 2003
Posts: 920
Likes: 0
From: bumfuck egypt, SD, US
Re: (Boosted_B_Series)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Boosted_B_Series »</TD></TR><TR><TD CLASS="quote">Good point..
I just wonder if I don't use valves on the feed lines if one is pressurized and the other one isnt, wont the fuel in the other feed line be diluted up to the pump by the other one? It seems to me that it would take a while for the engine to use up all the fuel in a 8an line the length of the car.
I could probably eliminate the feed valves with check valves for sure. Anyone know were I can buy fuel check valves. I am searching now..
Edit: I found some aeromotive one way valves but they are $70 each.. ouch
Were would I plum the return? In the bottom or top of the fuel cell? I plan on running a 8an feed and a 6an return.
Would 8an to pump and 8an to rail be ok? I normally see people run a little larger from tank to pump but I really don't have that option unless I want to daisy chain the two 8ans comming out of the cell and run my return to the top. </TD></TR></TABLE>
If you use 2 pumps, one for each tank, going into a Y to the feed line, you won't need any check valves or any valves at all on the feed side, if the pumps have their own check valves. Most pumps do. The walbro does.
As far as mixing the fuel together, yes that would happen with the amount left in th lines, since you'd be using the majority of the same feed and return lines, but once you calculate the amount of fuel in the line vs the amount of fuel in your tanks, you'll see this doesn't matter, (and that the mass of fuel the pump moves is enough to flush the line very quickly. Remember, at times of low injector duty cycle, almost all of the fuel is returned back to the tank.)
You Could do it with just 1 fuel pump too, with on/off valves in the feed lines from each tank, in addition to the valves after the return T. Either way..I don't really know how I'd do it. Actually I do, I'd just run e85 and have 1 setup.
I just wonder if I don't use valves on the feed lines if one is pressurized and the other one isnt, wont the fuel in the other feed line be diluted up to the pump by the other one? It seems to me that it would take a while for the engine to use up all the fuel in a 8an line the length of the car.
I could probably eliminate the feed valves with check valves for sure. Anyone know were I can buy fuel check valves. I am searching now..
Edit: I found some aeromotive one way valves but they are $70 each.. ouch
Were would I plum the return? In the bottom or top of the fuel cell? I plan on running a 8an feed and a 6an return.
Would 8an to pump and 8an to rail be ok? I normally see people run a little larger from tank to pump but I really don't have that option unless I want to daisy chain the two 8ans comming out of the cell and run my return to the top. </TD></TR></TABLE>
If you use 2 pumps, one for each tank, going into a Y to the feed line, you won't need any check valves or any valves at all on the feed side, if the pumps have their own check valves. Most pumps do. The walbro does.
As far as mixing the fuel together, yes that would happen with the amount left in th lines, since you'd be using the majority of the same feed and return lines, but once you calculate the amount of fuel in the line vs the amount of fuel in your tanks, you'll see this doesn't matter, (and that the mass of fuel the pump moves is enough to flush the line very quickly. Remember, at times of low injector duty cycle, almost all of the fuel is returned back to the tank.)
You Could do it with just 1 fuel pump too, with on/off valves in the feed lines from each tank, in addition to the valves after the return T. Either way..I don't really know how I'd do it. Actually I do, I'd just run e85 and have 1 setup.
Thread
Thread Starter
Forum
Replies
Last Post
hondaapi
Road Racing / Autocross & Time Attack
6
May 13, 2010 04:40 PM
ScottEK
Audio / Security / Video
28
Aug 23, 2002 02:12 PM