Fuel pump re wire HELP - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

s13dan · 03-24-2005, 11:08 PM

I need a re-wrie write up for a redtop SR and a walbro 255. i need to rewire with 10 ga and i have no idea what to do. i know i need a 30 amp relay and fuse. and i have part numbers. but i dunno how to actually do it. my battery is in my trunk so i was hopinh i could use a foot of wire and hard wire it. but then the pump would be on all the time. i want it off when the car is off. anyone know where i can see how to do this.

s13silady · 03-25-2005, 03:22 AM

there was a thread i did a while back...cant seem to find it but here...

Relay in trunk near fuel pump.

10-12ga. power wire direct from battery to input on relay.
Stock fuel pump power wire to + trigger on relay
Ground - (neg.) trigger and neg pole of relay to chassis

Stock fuel pump power will flip the relay, which in turn will power the fuel pump directly from the battery.

Worst case scenario and you blow the relay, just reconnect the stock wires and call it a day.

ENTHALPY on here should have a more descriptive write up, but i cant seem to find it... but then again... im too lazy to do your own work...
ANSWER

wootwoot · 03-25-2005, 08:08 AM

Whats the benefit of doing this anyway? Ive heard it spoken of before

orion::S14 · 03-25-2005, 10:10 AM

The higher elec load of a big fuel pump can't be supported by the stock wiring, especially on ~15 year old S13s.

This will insure the pump can flow what it's supposed to...fuel pump flow is directly related to the voltage it recieves.

- Brian

s13dan · 03-25-2005, 12:31 PM

my 255lph is prolly a 190lph right now.. and thanx silady

s13silady · 03-25-2005, 04:27 PM

np... yah you cant really really feel a difference... but at least your at ease knowing that your getting enough fuel... but iirc.. i dont think the stock injectors flow past a certain amount though... not for sure though... elaboration anyone?

03-24-2005, 11:08 PM	#1
s13dan Zilvia FREAK! Join Date: Aug 2003 Location: Springfield, Mo Posts: 1,519 Trader Rating: (2) Feedback Score: 2 reviews	Fuel pump re wire HELP I need a re-wrie write up for a redtop SR and a walbro 255. i need to rewire with 10 ga and i have no idea what to do. i know i need a 30 amp relay and fuse. and i have part numbers. but i dunno how to actually do it. my battery is in my trunk so i was hopinh i could use a foot of wire and hard wire it. but then the pump would be on all the time. i want it off when the car is off. anyone know where i can see how to do this. __________________ 89 240sx hatch #933-the hot rod 91 240sx coupe #131,603-the daily

03-25-2005, 03:22 AM	#2
s13silady Nissanaholic! Join Date: May 2002 Location: Bay Area, San Jose Posts: 1,804 Trader Rating: (0) Feedback Score: 0 reviews	there was a thread i did a while back...cant seem to find it but here... Relay in trunk near fuel pump. 10-12ga. power wire direct from battery to input on relay. Stock fuel pump power wire to + trigger on relay Ground - (neg.) trigger and neg pole of relay to chassis Stock fuel pump power will flip the relay, which in turn will power the fuel pump directly from the battery. Worst case scenario and you blow the relay, just reconnect the stock wires and call it a day. ENTHALPY on here should have a more descriptive write up, but i cant seem to find it... but then again... im too lazy to do your own work... ANSWER __________________

03-25-2005, 10:10 AM	#4
orion::S14 Nissanaholic! Join Date: May 2003 Location: Orange Park, FL Posts: 1,666 Trader Rating: (0) Feedback Score: 0 reviews	The higher elec load of a big fuel pump can't be supported by the stock wiring, especially on ~15 year old S13s. This will insure the pump can flow what it's supposed to...fuel pump flow is directly related to the voltage it recieves. - Brian __________________ www.KA24DEvelopment.com

03-25-2005, 12:31 PM	#5
s13dan Zilvia FREAK! Join Date: Aug 2003 Location: Springfield, Mo Posts: 1,519 Trader Rating: (2) Feedback Score: 2 reviews	my 255lph is prolly a 190lph right now.. and thanx silady __________________ 89 240sx hatch #933-the hot rod 91 240sx coupe #131,603-the daily

03-25-2005, 04:27 PM	#6
s13silady Nissanaholic! Join Date: May 2002 Location: Bay Area, San Jose Posts: 1,804 Trader Rating: (0) Feedback Score: 0 reviews	np... yah you cant really really feel a difference... but at least your at ease knowing that your getting enough fuel... but iirc.. i dont think the stock injectors flow past a certain amount though... not for sure though... elaboration anyone? __________________

03-25-2005, 08:08 AM	#3
wootwoot Post Whore! Join Date: Jan 2004 Location: sarasota florida biatch Age: 39 Posts: 3,850 Trader Rating: (0) Feedback Score: 0 reviews	Whats the benefit of doing this anyway? Ive heard it spoken of before

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