help me wire my fuel pumps
07-24-05, 10:47 AM
#26
Antracite Supra
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Location: NJ
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ive searched and everything... and i am not really understanding the intense fuel setups...when i built my sp57 supra up I used the VPC w/550 chip, stock injectors, a single walboro 255, FPR, pulse bypass etc. and it ran soooo rich at 472rwhp.
I have my R85 on the way and Im planning on just using my PFC for the next year or so with the HKS twinpower... I want serious numbers out of the turbo, but seriously do i need to be thinking about dual pumps, or can i just use a single walboro or cosmo pump ?
I have my R85 on the way and Im planning on just using my PFC for the next year or so with the HKS twinpower... I want serious numbers out of the turbo, but seriously do i need to be thinking about dual pumps, or can i just use a single walboro or cosmo pump ?
07-24-05, 11:08 AM
#27
3rd motors a charm I hope
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I would suggest that you dont use seperate fuel lines for each rail. If you have 2 fuel pumps thats a bigger chance of one of them breaking or failing then one of your rails will get no fuel. If your using the pump for extra safety, you should run one bigger stainless steel line with the 2 pumps Y blocked into the one line, then Y them off to each fuel rail in the engine bay and then connect with fuel line both rails to the regulator and then back to the return line.
As for wiring. You could run a 12V key-on (and cranking-on) ignition source to a relay, and then from the relay to a ground. Then have a wire coming directly from the batter with a fuse to the other side of the relay, then from the other side to the pump. This way,when the key is on you have power going through the relay which clicks on the relay and allows power to go from the battery to the fuel pump. Oh, you also have to ground the fuel pump of course. Hope this helps.
Adam
As for wiring. You could run a 12V key-on (and cranking-on) ignition source to a relay, and then from the relay to a ground. Then have a wire coming directly from the batter with a fuse to the other side of the relay, then from the other side to the pump. This way,when the key is on you have power going through the relay which clicks on the relay and allows power to go from the battery to the fuel pump. Oh, you also have to ground the fuel pump of course. Hope this helps.
Adam
01-05-06, 10:05 PM
#28
Originally Posted by DaleClark
First off, I would be SURE that a single pump can't do the job you need it to do. Two pumps more than doubles your failure points - the various hoses connecting them, the extra wiring, and the fact that one of the pumps could, in theory, fail.
I would either run a Walbro pump with a good 12v power source, or a good Nippondenso pump (Supra, Cosmo, etc.) with a Kenne-Bell Boost-a-Pump - that can step up the voltage to the pump under boost (running it over 12v) so you get more out of the pump. The Walbro doesn't do well with increased voltage, but it DOES flow a TON of fuel at 12-13 volts.
As far as wiring, the safest way is to use the stock fuel pump wiring for your "on" signal. The ECU will shut the pump off if the engine isn't running, which is a VERY good idea in case of a wreck - otherwise you could have a pump running after a wreck, pumping fuel at 40psi into a fire.
Run a decent-gauge (12 gauge would be fine for most any single pump) wire from the positive terminal of the battery back to the hatch. Make sure to put the fuse in the power wire fairly close to the battery terminal! Get a relay, use the stock fuel pump wire to switch the relay on, and have the new wire be switched by the relay. You can use the wiring to the fuel pump from just ouside the tank - that should do the job just fine.
I ran a similar setup in my TII for YEARS with no problems, always had battery voltage at the fuel pump, even with a full electrical load on.
If you do need to run 2 fuel pumps, I'd go with 10 gauge wiring, but do the same routine with the relay and everything - just make sure the relay is rated for the amount of current that's going through it. You will most likely need to run the big wire into the fuel tank - that would mean drilling a hole at the top of the fuel pump assembly, grommeting the hole, and running the wire through, then thoroughly covering with RTV to keep it sealed.
I'd also hit up Supraforums - many of the Supra guys have "been there, done that" on dual pump setups, and I'm sure they've found all the ins and outs of dual fuel pumps by now.
Dale
I would either run a Walbro pump with a good 12v power source, or a good Nippondenso pump (Supra, Cosmo, etc.) with a Kenne-Bell Boost-a-Pump - that can step up the voltage to the pump under boost (running it over 12v) so you get more out of the pump. The Walbro doesn't do well with increased voltage, but it DOES flow a TON of fuel at 12-13 volts.
As far as wiring, the safest way is to use the stock fuel pump wiring for your "on" signal. The ECU will shut the pump off if the engine isn't running, which is a VERY good idea in case of a wreck - otherwise you could have a pump running after a wreck, pumping fuel at 40psi into a fire.
Run a decent-gauge (12 gauge would be fine for most any single pump) wire from the positive terminal of the battery back to the hatch. Make sure to put the fuse in the power wire fairly close to the battery terminal! Get a relay, use the stock fuel pump wire to switch the relay on, and have the new wire be switched by the relay. You can use the wiring to the fuel pump from just ouside the tank - that should do the job just fine.
I ran a similar setup in my TII for YEARS with no problems, always had battery voltage at the fuel pump, even with a full electrical load on.
If you do need to run 2 fuel pumps, I'd go with 10 gauge wiring, but do the same routine with the relay and everything - just make sure the relay is rated for the amount of current that's going through it. You will most likely need to run the big wire into the fuel tank - that would mean drilling a hole at the top of the fuel pump assembly, grommeting the hole, and running the wire through, then thoroughly covering with RTV to keep it sealed.
I'd also hit up Supraforums - many of the Supra guys have "been there, done that" on dual pump setups, and I'm sure they've found all the ins and outs of dual fuel pumps by now.
Dale
TIA,
:-) neil
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