tims31
|
| posted on 4/4/13 at 12:58 PM |
|
|
Fuel system layout help
I could do with a bit of advice on my planned fuel system setup and see if this will work.
The fuel tank has a 13mm outlet from the swirlpot which I planned going to a in-line LP filter which would be about 400mm above the tank outlet, then
from there onto the fuel pump which is a Sytec in-line fuel pump (normal pressure 3 bar, max 8.5 bar flow 135ltr/hr –
see here ) then
onto 8mm kunifer pipe to the engine bay. (the filter supplied with the pump I will use just before the engine fuel rail)
What I need to know is, if I have the LP filter about 400mm above the level of the outlet from the tank and then onto the pump would the pump be able
to suck the fuel up the line and through the filter to get to the pump or do I need to think about putting the pump as close to the tank outlet as
possible without the inline filter?
Thank for any help
 
Fuel system
[Edited on 4/4/13 by tims31]
[Edited on 4/4/13 by tims31]
Build: http://www.martinsfurybuild.co.uk/
|
|
|
|
|
big-vee-twin
|
| posted on 4/4/13 at 01:47 PM |
|
|
High pressure fuel pumps are gravity fed and therefore need to be lower or at same level as the tank outlet, they cannot suck.
I have the same arrangement as you.
you will also need a return fuel line from the fuel rail via a regulator back to the tank.
[img]
.jpg) .jpg)
Fuel pump position
[/img]
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
|
|
|
silky16v
|
| posted on 4/4/13 at 02:24 PM |
|
|
my understanding is you fit the fuel filter after the pump, not before with inline setup's
could be wrong though, but every car i've ever build have been this way!
|
|
|
big-vee-twin
|
| posted on 4/4/13 at 03:49 PM |
|
|
in front of the pump to prevent debris getting into it
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
|
|
|
rx7locost
|
| posted on 4/4/13 at 05:43 PM |
|
|
In-tank EFI fuel pumps use a filter sock for the large debris, then a high pressure fine particle filter after the pump to keep the smaller stuff from
getting to the injectors. I think adding a low pressure "coarse" filter before an external HP pump In addition to the HP filter would be a
good idea.
All in-tank pumps that I have dealt with are an inch or 2 above the bottom of the tank, so they can suck at least that small amount in addition to the
filter sock restriction.
|
|
|
tims31
|
| posted on 5/4/13 at 09:34 AM |
|
|
yes, I have the return line installed too, I was just wondering about the fuel pump level as on the fury the ideal location for it is just above the
diff. Guess I will just have to find a better location for it.
I assume so long as the in-line filter before the pump is lower than the tank outlet then it will not affect the flow to the pump?
Build: http://www.martinsfurybuild.co.uk/
|
|
|
adithorp
|
| posted on 5/4/13 at 11:31 AM |
|
|
I had mine mounted above the diff' intially as it was easy on the Fury as you say. It will suck that high but it's not ideal. You'll
find it cavitates the fuel exiting your LP filter (you'll see lots of bubles if it's a clear filter body) which isn't great.
Mine is now mounted on a bracket across the bottom of the diff cage. Much better there, with gravity feed there's no more bubbles.
I have a gauze on the tank pickup (to strain larger debris) in a sump/swirl-pot on the tank - pump - high presure filter - fuel rail - return direct
into tank sump.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
|
|
|
tims31
|
| posted on 5/4/13 at 11:52 AM |
|
|
great adithorp, that's what I needed. could you pop a picture on here so I can see how you did it? Are you using the tank from Fury, if so how
did you get the gauze in the tank before the swirl pot? I may just have to use an inline before the pump
thanks
[Edited on 6/4/13 by tims31]
Build: http://www.martinsfurybuild.co.uk/
|
|
|
adithorp
|
| posted on 5/4/13 at 12:17 PM |
|
|
quote:
Originally posted by tims31
great auditors, that's what I needed. could you pop a picture on here so I can see how you did it? Are you using the tank from Fury, if so how
did you get the gauze in the tank before the swirl pot? I may just have to use an inline before the pump
thanks
I should have a picture at home on my lap-top. I'll post when I get home but it'll e late as riday is "fish+chip night" at my
Dads.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
|
|
|
tims31
|
| posted on 5/4/13 at 04:07 PM |
|
|
Thanks Adithorp that would be great, no rush.
Fish n Chips at My parents this evening too...
Build: http://www.martinsfurybuild.co.uk/
|
|
|
adithorp
|
| posted on 5/4/13 at 10:23 PM |
|
|
The silver strip at the top is an ally strip bolted across the chassis/diff cage. There's then 3 rubber bobbins between that and the ally that
the pump and filter are attached to.
I did have the plastic 6.5 gallon Fisher tank originally (think it's still on in the pic's) but now have an ally one. The feed connection
on both is a banjo fitting. I made a gauze strainer by wrapping some fine stainless mesh around a piece of thin bar several times until the the
outside diameter was just a fit in the hole into the tank. Then I twisted one end to close it of and removed the bar leaving a cigar shaped gauze
tube (same length as the tanks sump). I then splayed the other end a bit so that the banjo bolt could trap it at the bottom of the tread. Insert into
feed and connect up. I initially added a pre=filter between the tank and pump but it collected nothing so I removed it (the ends were too small really
for the 12mm feed pipe). Coming up to 20,000 miles like that.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
|
|
|
tims31
|
| posted on 6/4/13 at 08:24 AM |
|
|
Great, Thanks for your help
Build: http://www.martinsfurybuild.co.uk/
|
|
|
A1
|
| posted on 6/4/13 at 10:38 AM |
|
|
All your filters should be before your pump to protect it.
|
|
|
adithorp
|
| posted on 6/4/13 at 11:13 AM |
|
|
quote:
Originally posted by A1
All your filters should be before your pump to protect it.
So why do ALL tin-top manufacturers put the fuel filter (except gauze on the pick-up) after the pump? How would you achieve that with an in tank
pump? What happens to any debris from the pump itself?
The HP, in-line, micro-filter is there to protect the injectors.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
|
|
|
tims31
|
| posted on 6/4/13 at 03:39 PM |
|
|
I got the HP inline filter free with the pump when I bought it so was going to put this in the engine bay just before the fuel rail to protect the
injectors but as stated on here I was going to put in an inline LP filter before the pump to protect it and filter out the fuel from the tank before
the pump.
Build: http://www.martinsfurybuild.co.uk/
|
|
|
atomic
|
| posted on 9/4/13 at 12:59 PM |
|
|
You should use pre & post filters.
75-100 Micron before the pump, and <30 Micron post pump, somewhere around 10 Micron most likely. It's also worth while fitting a one way
check valve before the pre pump filter so it will keep pressure in your lines and greatly aid in hot starting.
|
|
|
.jpg)
