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Need help.....No power to Fuel pump and injectors

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Old 07-15-2009, 03:43 AM
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Originally Posted by gingles
hrmmmmmm........give me a second and ill run out to my car and tell you

sweet thanks bro
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Old 07-15-2009, 03:43 AM
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you cant wire the rc injectors backwards
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Old 07-15-2009, 03:44 AM
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swap your horn relay with your efi relay and lemme know.....also.....check the voltage during startup at the fuel pump
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Old 07-15-2009, 03:50 AM
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Originally Posted by gingles
swap your horn relay with your efi relay and lemme know.....also.....check the voltage during startup at the fuel pump



Already swapped the Horn and EFI relay.

Do you mean test the volts while cranking the motor? Cause I havent tried that yet. Only tested with the key turned on.


Good to know about the injectors cause thats what I thought untill someone said different. I just wired them up and didnt worry about + and - cause I thought it didnt matter.
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Old 07-15-2009, 03:52 AM
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BTW after a Google search it seems other Toyota cars have a C/OPN relay that controls the fuel pump and well as injectors and they all seem to be able to remove this relay for a pump swap. Now Id guess that since the service manual says there is a C/OPN relay that I could find it but I cant!


I hate stupid porblems!
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Old 07-15-2009, 03:53 AM
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yea test the voltage while your cranking your car....and check your pm's
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Old 07-15-2009, 04:36 AM
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Just got off the phone with Gingles.....We may have figured it out. Going to test it out tomorrow and let everyone know the results.


Thanks again man!
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Old 07-15-2009, 05:21 AM
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no prob....keep us posted
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Old 07-16-2009, 12:33 AM
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Got fuel now.....everywhere btw.

One of the injectors orings got pintched and shot fuel everywhere.......so Im 100% sure the pump works now


Whats a good setting for the FPR with 1000cc RC's?
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Old 07-16-2009, 02:02 AM
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what was the problem?
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Old 07-16-2009, 02:13 AM
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turned out i never tried to crank the motor with the fuel pump connected to the car.


i turned the key to on and didnt hear it or see fuel pressure......so i figured something was wrong.....so i took the pump out to start testing crap.

our pumps dont prime before you start the car fyi.

so once i connected the pump back up and cranked it.....bam! works
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Old 07-16-2009, 06:09 AM
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yamaha....normal fuel pressure is around 45-50psi.......thats what i run on 750's
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Old 07-16-2009, 11:02 AM
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Originally Posted by yamaha16bw
turned out i never tried to crank the motor with the fuel pump connected to the car.


i turned the key to on and didnt hear it or see fuel pressure......so i figured something was wrong.....so i took the pump out to start testing crap.

our pumps dont prime before you start the car fyi.

so once i connected the pump back up and cranked it.....bam! works


So you were trying to start the car without a fuel pump? Is that what I'm understanding? If so, I ought to give you one upside the head... Glad you got it figured out...
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Old 07-16-2009, 11:05 AM
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lmao....it happens
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Old 07-16-2009, 01:10 PM
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Originally Posted by rhythmnsmoke
Originally Posted by yamaha16bw
turned out i never tried to crank the motor with the fuel pump connected to the car.


i turned the key to on and didnt hear it or see fuel pressure......so i figured something was wrong.....so i took the pump out to start testing crap.

our pumps dont prime before you start the car fyi.

so once i connected the pump back up and cranked it.....bam! works


So you were trying to start the car without a fuel pump? Is that what I'm understanding? If so, I ought to give you one upside the head... Glad you got it figured out...

No he didint even crank it! he was trying to listen for the pump with igntion on!

My aem box does do this though!
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Old 07-16-2009, 02:28 PM
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Originally Posted by ElevationTC
Originally Posted by rhythmnsmoke
Originally Posted by yamaha16bw
turned out i never tried to crank the motor with the fuel pump connected to the car.


i turned the key to on and didnt hear it or see fuel pressure......so i figured something was wrong.....so i took the pump out to start testing crap.

our pumps dont prime before you start the car fyi.

so once i connected the pump back up and cranked it.....bam! works


So you were trying to start the car without a fuel pump? Is that what I'm understanding? If so, I ought to give you one upside the head... Glad you got it figured out...

No he didint even crank it! he was trying to listen for the pump with igntion on!

My aem box does do this though!

So, just trying to listen to see if the pump was priming? Didn't hear it, and assumed something was wrong....so took it out, and then was trying to start without a pump? LOL....I think I just confused myself, can someone break this down for me in a chronological order?
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Old 07-16-2009, 04:33 PM
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built his motor......put everything on.......put walbro fuel pump in.......turned the key to on to see if the fuel pump was working.......ours doesnt prime itself so he thought something was wrong.........BAM!!!
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Old 07-16-2009, 04:39 PM
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Guys guys.....

I never tried to start the motor without a pump...lol

Since I didnt hear it prime I took it out and was trying everything to get power to that fuel pump plug on the harness. As it turns out that plus doesnt see ANY power till its cranked.....which I hadnt tried.


I never TRIED to start the car without a pump......im not that stupid


Just over looked one small thing......


Keep an eye out though...I'll have a whole build thread here real soon with ton!!! of pics.
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Old 07-16-2009, 04:51 PM
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im jealous btw.....when you told me all the stuff you had it made me realize ive got a ways to go......damnit
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Old 07-16-2009, 05:59 PM
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Well I wish I would of done a LSD while I was at it.

Which I'll end up doing as soon as the weather goes south in the fall, prolly with a twin disk as well.


Other then that there isnt much else to do. I could of sleeved it but didnt cause I'm prolly not going to push it to the point where I'd need them.
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