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Location:
Brisbane
Registered:
March 2003
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Fuel Pump Question
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Thu, 15 July 2004 13:47
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ok im running an electric pump on my ta22, its a Pierburg sealed unit rated to flow at 100L nhr, but it doesnt seem like its flowing very well, i did use it at first without a return line, could this have stuffed my pump up by means of backpressure? or will the pump just keep pumping and eventually flood the motor? im running a return line now and my carbs arnt in good shape but even still i pull one of my fuel hoses off before the fuel filter and it just trickles out with the pump on, is that normal?
ive checked voltage and its running at a constant 9V, shouldnt it be running at 12V like it says on its specifications?
cheers guys.
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Location:
Brisbane
Registered:
May 2002
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Re: Fuel Pump Question
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Thu, 15 July 2004 23:47
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Yes your pump should be getting at least 12V at all times. If you're seeing 9V your wiring is obviously not up to scratch.
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Location:
Brisbane
Registered:
March 2003
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Re: Fuel Pump Question
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Thu, 15 July 2004 23:50
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yes im pretty sure that was the case, thanks norbie.
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Location:
Brisbane
Registered:
March 2003
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Re: Fuel Pump Question
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Fri, 16 July 2004 00:14
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was just thinking if it were running at 12V would i see an improvement in flow? Also were would be a good place to hook it up since i am not up to scratch with ma electrics..
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Location:
Brisbane
Registered:
May 2002
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Re: Fuel Pump Question
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Fri, 16 July 2004 01:29
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Yes you will see a major improvement in flow once it's getting enough power.
As for the wiring, run a nice heavy cable to the engine bay and hook it up to the battery via relay and fuse. Fuel pumps draw a lot of current so you need good wiring or you'll see a nasty voltage drop, which is what you're seeing now.
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Location:
Brisbane
Registered:
March 2003
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Re: Fuel Pump Question
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Thu, 29 July 2004 02:57
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ok i bought a relay its a 12V 30/40A 5pin with Diode, but now i have to buy wire for my other connections, the main one being my power cable and fuse, what size wire and fuse would i be looking at? i know it should be thick wire but unsure of which.. and wires that lead to ground does it matter what size wire i use there also?
anyone who has done this before can you point me in the right direction from here..
cheers.
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Location:
Rosanna, Melb
Registered:
June 2002
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Re: Fuel Pump Question
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Thu, 29 July 2004 03:35
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You get the same current flowing to ground as you have flowing to the pump, so yes, use fat wires for both.
I measured the current my pumps pulled while running and picked up some fat wire that was "rated" to above that (You may have to be careful because the pump will pull more current on 12V than it does on 9V now).
Run that all the way from battery, through suitably rated fuse, to relay, then to pump and then to ground. I just grounded it to the body down the back near the pump, works fine for me.
The other connections to the relay, the switching signal from ignition/computer can be skinny wires as they don't pull much current.
Hen
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Location:
Brisbane
Registered:
March 2003
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Re: Fuel Pump Question
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Thu, 29 July 2004 04:49
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kool thats alot of help cheers for that,
the box the relay came with had the markings on the back
PIN 30 = Pwr in
PIN 85 = Earth
PIN 86 = Switch
PIN 87 = Power out ACC 1
this has got me confused as to where im going to wire my pump up..
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Registered:
November 2002
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Re: Fuel Pump Question
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Thu, 29 July 2004 05:28
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That is a typical relay pin configuration, and this is what you do with the numbers:
PIN 30 runs back through a fuse and then to your +ve post on your battery. Or pick up the right wire downstream from your car's fuse block.
PIN 85 goes to an earth, and you may want to be pedantic and earth your fuel pump with this wire as well. But its not necessary.
PIN 86 runs off to your circuit opening relay. This is what sends the signal to switch the pump on/off.
PIN 87 drives your fuel pump - is the power supply (+ve) of your pump.
Easy as.
Cheers,
Mitch.
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Location:
Brisbane
Registered:
March 2003
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Re: Fuel Pump Question
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Thu, 29 July 2004 06:06
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so basicly i can leave my negative on my pump alone because 85 is being ground?
The circut opening relay, where can i find it? if its labled the same in the celica manual i should be able to locate it there via wiring diagrams?
thanks much appreciated.. 
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Registered:
November 2002
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Re: Fuel Pump Question
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Thu, 29 July 2004 06:39
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No.
Ground your pump ! I was trying to say you *could* join the negative from the pump to the wire from the 85 pin, which is going to earth. As said above, earth your pump somewhere close to where it is mounted.
You won't have a COR on a TA22 with carbs and no EFI. This is where is gets a little tricky for you and it has been covered in other posts, so SEARCH as well.
If you switch your pump from your IGN wire, it will always pump when IGN is on, which is not good if you have had an accident and your car is upside down and on fire, with the pump feeding fuel to it. There are other better ways to switch the pump on and off including using the oil pressure sender signal and/or a mercury micro-switch.
But I don't know enough to comment with knowledge here. Hopefully someone else will chime in.
Mitch.
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Location:
Brisbane
Registered:
March 2003
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Re: Fuel Pump Question
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Thu, 29 July 2004 07:30
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yes i do realise i will have to install a kill switch to prevent accidents becomming fatal accidents but at the moment im doing this so i can get my car running.
thanks for the help. i will look into it abit more..
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