XLR8S
Novice Class
Posts: 63
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posted March 29, 2010 02:53 AM
ZX14 Turbo Fuel Pump Question
Question on running an external pump on a turbo zx14. I understand I need to run a modified fuel rail, with a return and a regulator. I have read that the stock 14 fuel pump is pulse modulated so I assume the voltage is controlled by the ECU? If that is the case do I have to use a different power source to run my external pump, or can I still use the stock fuel pump power wires?
Thanks for the help. setting up a GT28R to run at 7PSI, will post numbers when I get them.
Thank You!
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ZX14, 1 piece at a time............. Roger
  
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Compton
Zone Head
Posts: 969
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posted March 29, 2010 03:11 AM
Just use the stock pump wiring to trigger a relay from battery power.
And no the voltage is not controlled by the ECU. Its just a set static pressure and thats it.
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b.w.
zx14, little longer, little louder, little lower.
08 Busa, just a little longer and louder and lower than the 14
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boostphreak
Expert Class
Posts: 168
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posted March 29, 2010 05:52 AM
yes, what he said!! I also used the stock fuel pump hot wire for my scavage pump . when you turn the key on the ecu cycles the fuel pump (and also the scavage pump) for 5 or 6 seconds. not sure how long but thats close. and then comes on as long as the motors running. keep us posted on those numbers. my 16g @5psi made 250 hp.
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JDC
Zone Head
Posts: 570
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posted March 29, 2010 08:14 AM
 Edited By: JDC on 29 Mar 2010 16:20
quote:
Question on running an external pump on a turbo zx14. I understand I need to run a modified fuel rail, with a return and a regulator. I have read that the stock 14 fuel pump is pulse modulated so I assume the voltage is controlled by the ECU? If that is the case do I have to use a different power source to run my external pump, or can I still use the stock fuel pump power wires?
Thanks for the help. setting up a GT28R to run at 7PSI, will post numbers when I get them.
Thank You!
I have the OEM fuel rail. Works just fine.
I did mod the fuel tank pump mounting bracket some, for better flow and return feed lines.
If I remember correctly, I cut the tube on the other side about flush. Power to the new external fuel pump is from a relay which triggers when the ignition is turned on. Very simple.
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XLR8S
Novice Class
Posts: 63
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posted March 29, 2010 11:08 AM
Thanks Guys, sounds easy enough. JDC, you said you used the stock fuel rail, but modded the tank plate for better flow and "return." The stock rail doesn't have a return, did you mod the stock rail for a return?
I'll definately keep you posted on numbers once I get this thing together. It's 70" wb and I had Adams do a shock, cut 1 inch, re-sprung and re-valved. If it hooks, should go pretty good.
Track opens this weekend but I'll have to start the season on my 12 I guess. Running out of parts faster than money is coming in. Welcome to drag racing right? LOL!!
____________
ZX14, 1 piece at a time............. Roger
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