fuel pump hardwire/rewire - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

s13silady · 10-07-2004, 10:21 AM

anyone know if its possible? or anyone done it before here in san jose willing to help me out? basically i want the fuel pump to run off its own power source but still connect to my ECU for the stock prime effect...

i did a search and came up with the 30amp relay conversion... just wondering if this owuld get rid of my problem with the shorting wires causing my car not to start sometimes.

thanks

-ryan..

Dousan_PG · 10-07-2004, 10:26 AM

yeah possible
find the power line on the harness
easy to do. super easy
mega easy

break out the FSM

msaskin · 10-07-2004, 10:33 AM

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.

~matt

s13silady · 10-10-2004, 05:00 AM

ok quick recap... i hardwired my fuel pump completely with its own power source (battery), independant ground, and new relay. and i spliced into the ignition wire of my turbo timer...fuel pump gets power no problem at all.. the cars still not starting... so my other buddy with an SR stops by and lets me swap ignitor chips to see if this was the cause... same thing no go...
it just cranks and cranks and cranks.. doesnt turn over all the way...
a shop told me that the power leak is coming from ignition relay... i have yet to check that will do first thing in the morning...(oh and also my coil packs..)
can someone also tell me where the ignition relay is located? (seems dumb but im having a small problem trying to find it...)

SR20DET redtop...in a 90FB...

if anyone can throw out suggestions that would help me trouble shoot id be very greatful...

CLIFFNOTES: my car cranks..doesnt turn over.. rewired fuel pump.. works good now...checked for spark..none...checked ignitor chip, and not the problem...

s13silady · 10-10-2004, 12:23 PM

anyone????

proj240sx · 10-10-2004, 12:57 PM

did you pull your plugs out and check to see if they are even sparking?

edit: whoops sorry

s13silady · 10-10-2004, 01:04 PM

Quote:

Originally Posted by proj240sx

did you pull your plugs out and check to see if they are even sparking?

"...checked for spark.."

yes i did...

kickertu · 10-10-2004, 01:19 PM

might be a wiring issue..

i know this is dumb.. but is your ecu screwed into the harness?

driftstyre · 10-10-2004, 07:23 PM

The IGN Relay is in the fuse box in front of the passenger fender. The fuel pump (IGN Pump) relay is right next to that. I recently had a similar problem and ended up re-timing the crank angle sensor and the engine ran but would misfire under load conditions. The more I turned the CAS clockwise the better it ran. If you're getting spark and fuel it most likely is your CAS as its firing at the completly wrong times.

s13silady · 10-10-2004, 08:29 PM

i thought it was my cas too.. but if a cas were to go out it would have more of a chance to go out mechanically and not electrically... the problem i have is an intermittant (sp?) problem.. so it has to be electrical... im going to have my wiring checked out first thing monday... ill keep posted...

oh and also i see a lot of people lately have been having fuel pump issues so im going to do a write up for the fuel pump relay mod with pics as soon as i get this problem squared...

AN89HATCH · 10-10-2004, 11:51 PM

Quote:

Originally Posted by s13silady

i thought it was my cas too.. but if a cas were to go out it would have more of a chance to go out mechanically and not electrically... the problem i have is an intermittant (sp?) problem.. so it has to be electrical... im going to have my wiring checked out first thing monday... ill keep posted...

oh and also i see a lot of people lately have been having fuel pump issues so im going to do a write up for the fuel pump relay mod with pics as soon as i get this problem squared...

check your distributor cap and rotor

kazuo · 10-11-2004, 01:48 AM

Quote:

Originally Posted by AN89HATCH

check your distributor cap and rotor

He has a RWD SR20DET.

I was glossing over the post and I just read it... seems you did it all wrong dude. That's why its not working. You're looking for the solution in all of the wrong places.

GO search FA under username "Enthalpy," he posted a very simple schematic on how to do it.

Good luck

kazuo · 10-21-2004, 01:06 AM

You need a multimeter, a FSM and a lot of patience.

I say you bypass your stock wiring, run your own power/ground wires to the pump, and wire a relay in the back. Make sure the power wire has a fuse inline.

That way, you cut out the bullshit and get the problem solved ASAP.

Total cost = less than $50 and itll take like an hour or two

I think Enthalpy also posted how to do it on FA? It's not too hard...

s13silady · 10-21-2004, 01:10 AM

ive done that...but i have arised to the new problem of not getting any spark... a shop told me that the problem was sourced to the ignition relay... but im thinking that its the main relay... but i dont know how to get to it..

kazuo · 10-21-2004, 01:18 AM

Quote:

Originally Posted by s13silady

ive done that...but i have arised to the new problem of not getting any spark... a shop told me that the problem was sourced to the ignition relay... but im thinking that its the main relay... but i dont know how to get to it..

All the relays are right there in the engine bay in the fuse box. Big ass green ones IIRC.

I dunno what your problem is... if you bypassed it it should work fine... if you're not getting spark, you have bigger fish to fry.

Good luck

s13silady · 10-21-2004, 09:50 AM

well i was told the MAIN RELAY is under the dash somewhere... i just need this clarified..

10-07-2004, 10:21 AM	#1
s13silady Nissanaholic! Join Date: May 2002 Location: Bay Area, San Jose Posts: 1,804 Trader Rating: (0) Feedback Score: 0 reviews	fuel pump hardwire/rewire anyone know if its possible? or anyone done it before here in san jose willing to help me out? basically i want the fuel pump to run off its own power source but still connect to my ECU for the stock prime effect... i did a search and came up with the 30amp relay conversion... just wondering if this owuld get rid of my problem with the shorting wires causing my car not to start sometimes. thanks -ryan.. __________________

10-07-2004, 10:26 AM	#2
Dousan_PG Post Whore! Join Date: May 2002 Location: Orange County, California Age: 46 Posts: 16,640 Trader Rating: (23) Rides Gallery: Dousan_PG Feedback Score: 23 reviews	yeah possible find the power line on the harness easy to do. super easy mega easy break out the FSM __________________ Aaron Pink GodziRa www.geocities.com/pink_godzira

10-07-2004, 10:33 AM	#3
msaskin Zilvia Member Join Date: Feb 2004 Location: Las Vegas, NV / Albany, NY Age: 41 Posts: 268 Trader Rating: (0) Rides Gallery: msaskin Feedback Score: 0 reviews	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. ~matt __________________ it's not turbo lag...it's foreplay '01 Ford Excursion Limited. Powerstroke Diesel Coming in spring: ???

10-10-2004, 05:00 AM	#4
s13silady Nissanaholic! Join Date: May 2002 Location: Bay Area, San Jose Posts: 1,804 Trader Rating: (0) Feedback Score: 0 reviews	ok quick recap... i hardwired my fuel pump completely with its own power source (battery), independant ground, and new relay. and i spliced into the ignition wire of my turbo timer...fuel pump gets power no problem at all.. the cars still not starting... so my other buddy with an SR stops by and lets me swap ignitor chips to see if this was the cause... same thing no go... it just cranks and cranks and cranks.. doesnt turn over all the way... a shop told me that the power leak is coming from ignition relay... i have yet to check that will do first thing in the morning...(oh and also my coil packs..) can someone also tell me where the ignition relay is located? (seems dumb but im having a small problem trying to find it...) SR20DET redtop...in a 90FB... if anyone can throw out suggestions that would help me trouble shoot id be very greatful... CLIFFNOTES: my car cranks..doesnt turn over.. rewired fuel pump.. works good now...checked for spark..none...checked ignitor chip, and not the problem... __________________

10-10-2004, 12:23 PM	#5
s13silady Nissanaholic! Join Date: May 2002 Location: Bay Area, San Jose Posts: 1,804 Trader Rating: (0) Feedback Score: 0 reviews	anyone???? __________________

10-10-2004, 12:57 PM	#6
proj240sx Zilvia Junkie Join Date: Sep 2003 Location: SF Bay Area, CA Age: 41 Posts: 479 Trader Rating: (6) Feedback Score: 6 reviews	did you pull your plugs out and check to see if they are even sparking? edit: whoops sorry __________________ 90 RPS1345 hybrid thingy & 01 IS300 Last edited by proj240sx; 10-10-2004 at 01:50 PM..

10-10-2004, 01:19 PM	#8
kickertu Zilvia Junkie Join Date: Jul 2002 Posts: 377 Trader Rating: (1) Feedback Score: 1 reviews	might be a wiring issue.. i know this is dumb.. but is your ecu screwed into the harness?

10-10-2004, 07:23 PM	#9
driftstyre Zilvia.net Advertiser Join Date: Jul 2003 Location: Boston Age: 46 Posts: 748 Trader Rating: (4) Feedback Score: 4 reviews	The IGN Relay is in the fuse box in front of the passenger fender. The fuel pump (IGN Pump) relay is right next to that. I recently had a similar problem and ended up re-timing the crank angle sensor and the engine ran but would misfire under load conditions. The more I turned the CAS clockwise the better it ran. If you're getting spark and fuel it most likely is your CAS as its firing at the completly wrong times.

10-10-2004, 08:29 PM	#10
s13silady Nissanaholic! Join Date: May 2002 Location: Bay Area, San Jose Posts: 1,804 Trader Rating: (0) Feedback Score: 0 reviews	i thought it was my cas too.. but if a cas were to go out it would have more of a chance to go out mechanically and not electrically... the problem i have is an intermittant (sp?) problem.. so it has to be electrical... im going to have my wiring checked out first thing monday... ill keep posted... oh and also i see a lot of people lately have been having fuel pump issues so im going to do a write up for the fuel pump relay mod with pics as soon as i get this problem squared... __________________

10-21-2004, 01:06 AM	#13
kazuo Post Whore! Join Date: Aug 2002 Location: Posts: 2,762 Trader Rating: (3) Feedback Score: 3 reviews	You need a multimeter, a FSM and a lot of patience. I say you bypass your stock wiring, run your own power/ground wires to the pump, and wire a relay in the back. Make sure the power wire has a fuse inline. That way, you cut out the bullshit and get the problem solved ASAP. Total cost = less than $50 and itll take like an hour or two I think Enthalpy also posted how to do it on FA? It's not too hard...

10-21-2004, 01:10 AM	#14
s13silady Nissanaholic! Join Date: May 2002 Location: Bay Area, San Jose Posts: 1,804 Trader Rating: (0) Feedback Score: 0 reviews	ive done that...but i have arised to the new problem of not getting any spark... a shop told me that the problem was sourced to the ignition relay... but im thinking that its the main relay... but i dont know how to get to it.. __________________

10-21-2004, 09:50 AM	#16
s13silady Nissanaholic! Join Date: May 2002 Location: Bay Area, San Jose Posts: 1,804 Trader Rating: (0) Feedback Score: 0 reviews	well i was told the MAIN RELAY is under the dash somewhere... i just need this clarified.. __________________

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