Fuel Pump Relay

Numbles

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#1

• Mar 15, 2006

• #1

Anyone nkow where the fuel pump relay is on a 93 lx. I remember hearing it was under the passenger seat but that might have been in my sn95 days. Any help would be appreciated. BTW, there is non under my passenger seat so it has to be somewhere else. The only thing under there is the amp for the stereo.

THanks
Dan.

 

Saleen0679

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#2

• Mar 15, 2006

• #2

Right hand side of engine compartment. Lower front of wheel well.

 

Numbles

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#3

• Mar 15, 2006

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Would it still be there if the factory computer and wiring harness is gone.

 

Numbles

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#4

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Would one of these be what you are talking about.

 

Saleen0679

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#5

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• #5

One of those should be your WOT cutout relay the other should be the fuel pump relay. The fuel pump relay should have a PK/BK, Red, LB/O, and a DG/Y set of wires.

 

Numbles

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#6

• Mar 15, 2006

• #6

Well the wiring harness for the engine compartemnet is now gone because of my new setup. Therefore no fuel pump relay. Anyone know where the best place would be to wire my own. The only wiring harnesses left in the car will be the dash harness and body harness.

 

HISSIN50

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#7

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• #7

If installing a new harness, I would put the relay back inside the car (element protection). If doing a prefabbed harness or donor harness, you will probably keep it in the oem spot (next to the WOT relay on late 92+ [IIRC] and under the dr seat before that).

Good luck.

 

Numbles

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#8

• Mar 15, 2006

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It will be a donor harness.

Sorry for the ignorant question but what is the WOT relay for.

 

HISSIN50

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#9

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The WOT disengages the AC compressor at well, WOT. Helps keep parasitic draw down.

 

Numbles

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#10

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Ahh. I have no A/C so I dont have to worry about that anymore. Thanks for the info.

Ill be upgrading to a 255lph pump in the short future. What amp relay should I got.

I was also just going to wire the relay to the battery with a fuse and use the computer to activate the relay. Does this sound good?

 

HISSIN50

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#11

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Numbles said:

I was also just going to wire the relay to the battery with a fuse and use the computer to activate the relay. Does this sound good?

Click to expand...

A Bosch SPST or SPDT 30 amper should work, though the very knowledgable Saleen might know of a better quality relay to use for fuel delivery.

If not using the stock puter settings on the relay, you could:

If using the puter's control ground pulse (a la OEM), you can run that to the neg coil terminal. Run key-on 12 volts to the positive coil terminal (this is a good wire to install your inertia switch in, if you can).

If ditching all that puter stuff, I would just run a constant ground to the neg relay coil and use key-on 12 volts to the positive relay coil to energize the relay. Just dont let the car sit in the key-on position for very long without starting it.
Ive done this on a car I converted from mech pump to an elec pump, and I installed an inline switch so I could listen to the radio (no accessory position - old Italian car here).

Good luck.

 

Numbles

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#12

• Mar 15, 2006

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Thanks for the info. Ill have my entire setup posted up when the car is done.