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05-08-2013, 10:17 AM | #126 | |
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Tri-State
Location: Danbury, CT
Vehicle:2015 Mustang GT Black |
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05-08-2013, 10:28 AM | #127 | |
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South East
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Vehicle:2007 WRX STi PTE6266 OBP |
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05-08-2013, 01:31 PM | #128 |
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NESIC
Location: Newport
Vehicle:2012 STI sedan Black with scratches |
Stop being paranoid, there are multiple sources available that state the current carrying capacity of PVC insulated wiring. The wire in my 2012 STI sedan is 18AWG PVC insulated capable of handling 16 amps at a distance of ~8ft. The insulation has a melting point of 105*c and it is one cable bundle, so it doesn't have any derating factors. It is perfectly safe to run a 10awg wire from your battery (relay switched) directly into your fuel pump connector (wired the correct way) and use the OEM return. It is not good for your fuel pump to run 100% all the time, unless it was designed to do so. The entire reason for doing this is to decrease voltage drop. If you really want to get froggy about it, you can use a solid state relay from crydom and use that to switch a straight ground to chassis that uses the OEM FPC return line as an input.
J1128_201210 this is the SAE document number for low voltage primary cable http://www.powerstream.com/Wire_Size.htm this website has a chart on cable size selection that is accurate Last edited by dstroy; 05-08-2013 at 01:34 PM. Reason: documentation |
05-08-2013, 02:36 PM | #129 | |
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Vehicle:2002 WRX - 750WHP 9.5s @ 150mph |
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My main concern is the current through the OEM FPC. I have no idea what it's limits are. I would rather run a pump 100% of the time (10,000 hour life) than run the risk of damaging the OEM FPC and at worst causing a fire risk. |
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05-08-2013, 02:43 PM | #130 | |
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Join Date: Oct 2006
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Tri-State
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Quote:
it's toward the end of the thread |
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05-08-2013, 02:47 PM | #131 |
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Vehicle:2011 STI White |
What is the cost to replace the fuel pump controller?
There also seems to be many people who run pumps 100%. At the hours you get out of pump most likely you will be replacing the filter before it goes bad anyways an if you are going to replace the filter you might as well replace the whole thing. |
05-08-2013, 02:48 PM | #132 |
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I read somewhere 100$ wholesale
here ones on ebay for 59$ http://compare.ebay.com/like/2909107...Types&var=sbar some kind of part number Last edited by sexyyrex; 05-08-2013 at 02:58 PM. |
05-08-2013, 02:50 PM | #133 |
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05-08-2013, 02:53 PM | #134 |
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05-08-2013, 02:58 PM | #135 |
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Vehicle:2011 STI White |
My relay is right under the back seat. The foam is soft and compliant enough that you don't notice it. Plus my daughter's child seat is over it anyways.
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05-08-2013, 02:59 PM | #136 |
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05-08-2013, 03:05 PM | #137 |
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My wires to the pump go through the grommet of the cover and to the top of the hat.
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05-08-2013, 03:56 PM | #138 |
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05-08-2013, 04:36 PM | #139 |
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The only wire that I have tha connects back to the FPC is the positive from FPC to the relay that acts as the switch to turn on the pump. I splice into that wire between the pump an the connector under the seat.
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05-09-2013, 09:54 AM | #140 |
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E. Canada
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Vehicle:2006 STI-USDM SGM |
^^
Same as me. Fp is grounded to chassis as is the relay. Only wire from the fpc is the black/yellow to trigger the relay. Pump comes on with ign and stays on at 100% the entire time it is operating. I like this as the relay isn't getting worked really hard. I am keeping a spare relay in the car at all times. |
05-09-2013, 11:34 AM | #141 |
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Just to clarify for these folks in the 08+ STi for the 100% wiring:
the FP to FPC line that gets (for switch) cut is which color that is switched is which color? (pin 5) the FP to FPC line that gets cut(for ground) and grounds to chassis is which color? (pin 1-6) Last edited by sexyyrex; 05-09-2013 at 11:45 AM. |
05-09-2013, 11:45 AM | #142 | |
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05-09-2013, 11:53 AM | #143 | ||
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Quote:
GR is Green with a Red stripe (Negative) Last edited by sexyyrex; 05-09-2013 at 01:09 PM. |
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05-09-2013, 12:23 PM | #144 |
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GY is Green with a Yellow stripe (Positive)
GR is Green with a Red stripe (Negative) |
05-09-2013, 01:08 PM | #145 |
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05-12-2013, 01:01 AM | #146 |
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I wired up my pump tonight using the DW direct wire kit. I have the relay set up as said in this thread, with the battery across from the green/yellow wire on the pump side on the relay, and the ground across from the green/yellow wire on the chassis side.
I forgot to put the fuse in to the battery wire when I tested it, but the pump still primed. wtf? I'm wondering if I have a bad relay. The relay doesnt seem to have any markings on it at all that I can see, so I cant check to see if it's wired properly. If I test with a multimeter, what would I be looking for in a properly functioning system. I can pretty easily probe the wires coming off the relay. I'm thinking I should ground to the chassis and probe for 12v power. The only hot wire should be the one coming from the battery with the key off, and with key on, the one going to the pump should be hot as well. The other 2 should just basically be a switched ground. Am I thinking about this correctly? It's late and my brain is fried trying to figure this out... All I can think of is maybe DW had the wrong wires soldered to the relay, or I ended up with a bad relay. I dont think it matters, but this is an 05 STI fuel tank using my 02 wrx harness which plugged right in. EDIT: So I went out with a multimeter it looks like my wiring is backwards from above? I have 12v on black red and ground on black/yellow. What the crap? Got it figured out. Black/red from chassis as relay trigger, black/red from pump across from 12v from battery, ground to chassis. Works as it should. Last edited by simon021; 05-12-2013 at 02:53 AM. |
05-12-2013, 07:36 AM | #147 |
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Simply put you wired it up incorrectly if there is no fuse in the source wire and the pump still fires up.
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05-12-2013, 09:43 AM | #148 |
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Lmfao that's pretty apparent. I got it figured out last night. For some reason my green/red is positive and green/yellow was negative. Swapped them around and it works as excited expected
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05-12-2013, 10:26 AM | #149 |
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Good to see you got it all fixed. Congrats!
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05-16-2013, 05:58 AM | #150 |
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Question, my relay is a 12V 40A relay. If the car is running 13.5V when the alternator is running is that safe for the relay? When I touch my relay it is very hot.
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