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26-08-2008, 10:18 PM
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#1
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Breaking stuff on the Rallycar
Join Date: 04-05-2006
Location: Canberra
Posts: 520
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Why would you do this?
see pic
Why would someone run fuel pumps like this or am i just missing something.
The only reason i can think of is if one failed you would still have a pump pumping.
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27-08-2008, 09:01 AM
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#2
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Walking happens
Join Date: 04-08-2003
Posts: 1,126
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In series is a bit odd. I run two in parallel on a change-over relay.
The only thing I can think of that makes any sense is that one is capable of lifting the fuel out of the tank and the other isn't. No matter what, unless they're matched for flow and pressure, you're not going to get very good results.
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27-08-2008, 10:57 AM
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#3
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Mazdabater
Join Date: 17-02-2006
Posts: 376
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That's how mine is set up (came that way when I bought it). I had a little square one sucking through a Carter gold. They're switched to run separately - one as a spare. The little square one couldn't suck enough fuel through the Carter to fuel the Weber, whereas the Carter blows through the little one adequately.
I've replaced the little one with anothe Carter Gold (yet another ebay bargain I've picked up  ) and will see if it makes any difference.
If it still doesn't work, I'll plumb then in parallel as Andrew has suggested. This is the only way to do it IMHO. Just need a pair of Tee pieces. The pumps should act as a check valve, so there shouldn't be any backflow issues.
The switch I am using is rated at 30A, so I don't bother with relays. Just another thing to go wrong (I've had more relays fail than switches).
__________________
Remember that nothing is cheap if you end up having to throw it away.
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27-08-2008, 12:02 PM
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#4
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Throttle?Its an on/off switch!
Join Date: 06-12-2005
Location: Tring to sort out this RX2 Front end...HELP!!!!
Posts: 1,613
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Carter's are rotary vane pumps so put them in parallel. They wont like being drawn through.
Carter love 
__________________
       : Take your pick....
GT Tooling
PetesGararge : Motorsport Lifestyle Stuff http://alliancemotorsport.org/store/
AMS Motorsport : UK Sourced RX7 Parts and those really wierd Racecar bits too....
Tekko.com.au
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27-08-2008, 12:58 PM
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#5
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Mazdabater
Join Date: 17-02-2006
Posts: 376
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DOH!!!
Better get some fittings then.
__________________
Remember that nothing is cheap if you end up having to throw it away.
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27-08-2008, 09:46 PM
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#6
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Registered User
Join Date: 16-07-2006
Posts: 66
Rep Power: 3 
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The pump on the right in the picture is a rotary vane type and will work as a suction pump. The pump on the left is a pressure only pump and doesn't like being mounted above the fuel source. I'd suggest this is why they are fitted as such, however I run just the rotary style without any dramas.
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28-08-2008, 08:43 PM
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#7
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Still, Loves This Sport!
Join Date: 06-08-2006
Location: Queanbeyan
Posts: 257
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Is that in the B?
Where is the fuel tank?
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29-08-2008, 10:07 AM
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#8
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merry christmarse
Join Date: 02-12-2001
Location: upper lower Kambah heights
Posts: 466
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Quote:
Is that in the B?
Where is the fuel tank?
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Yep - it's his B - tank is out getting some munyard goodness (like mine :-))
__________________
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JAson & MARla Mc
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29-08-2008, 10:23 AM
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#9
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Breaking stuff on the Rallycar
Join Date: 04-05-2006
Location: Canberra
Posts: 520
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Quote:
Originally Posted by MattSearle
Is that in the B?
Where is the fuel tank?
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Who needs a fuel tank "this one runs on air" |
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29-08-2008, 10:25 AM
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#10
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Breaking stuff on the Rallycar
Join Date: 04-05-2006
Location: Canberra
Posts: 520
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If anyone wants to come around Sunday and give me a hand im sure there can be pizza and beer brought for the cause
if your up for the task PM so i know how much beer is needed  |
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