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Fuel Pump Hot Wire Question Again by hinesb1890
Started on: 10-23-2013 10:53 PM
Replies: 5 (451 views)
Last post by: hinesb1890 on 10-24-2013 09:59 PM
hinesb1890
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Report this Post10-23-2013 10:53 PM Click Here to See the Profile for hinesb1890Click Here to visit hinesb1890's HomePageClick Here to Email hinesb1890Send a Private Message to hinesb1890Edit/Delete MessageReply w/QuoteDirect Link to This Post
I didn't get to doing it this weekend but I would like to double check that it will be done correctly. I drew a diagram following Darth's instructions below but I am still not sure where the C203 connects in. Also for the oil sending unit I want to double check that I just cut the tan wire coming out from the sender.

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MulletproofMonk
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Report this Post10-23-2013 11:13 PM Click Here to See the Profile for MulletproofMonkClick Here to visit MulletproofMonk's HomePageSend a Private Message to MulletproofMonkEdit/Delete MessageReply w/QuoteDirect Link to This Post
Depends on what you are doing this for, swapped motor or 2.8 / 3.4 Fiero motor?

For a 3800, all you have to do is the picture of the relay and that looks correct since you have added the fuse and the additional ground... Clear out the upper left picture of cutting the Oil Pressure Sender wire. I assume that c203 is if you are using a more powerful fuel pump with like a 3.4 swap and using the stock Fiero wiring...
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[This message has been edited by MulletproofMonk (edited 10-23-2013).]

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Darth Fiero
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quote
Originally posted by hinesb1890:

I didn't get to doing it this weekend but I would like to double check that it will be done correctly. I drew a diagram following Darth's instructions below but I am still not sure where the C203 connects in. Also for the oil sending unit I want to double check that I just cut the tan wire coming out from the sender.



Your diagram looks correct. Now all you need to do is to connect the ECM/PCM's fuel pump relay output wire (green/wht) to the tan/wht wire going thru pin L of the Fiero's C203 connector. You need to hook it up so the ECM/PCM can power up the tan/wht wire going out thru the Fiero chassis wiring harness (not the original Fiero ECM harness).

-ryan

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hinesb1890
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Report this Post10-24-2013 08:50 AM Click Here to See the Profile for hinesb1890Click Here to visit hinesb1890's HomePageClick Here to Email hinesb1890Send a Private Message to hinesb1890Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Darth Fiero:


Your diagram looks correct. Now all you need to do is to connect the ECM/PCM's fuel pump relay output wire (green/wht) to the tan/wht wire going thru pin L of the Fiero's C203 connector. You need to hook it up so the ECM/PCM can power up the tan/wht wire going out thru the Fiero chassis wiring harness (not the original Fiero ECM harness).

-ryan




So I just add a cross wire tapped into both? And I do or I don't cut the tan oil pressure sender wire?
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Darth Fiero
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Report this Post10-24-2013 02:41 PM Click Here to See the Profile for Darth FieroClick Here to visit Darth Fiero's HomePageClick Here to Email Darth FieroSend a Private Message to Darth FieroEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by hinesb1890:
So I just add a cross wire tapped into both? And I do or I don't cut the tan oil pressure sender wire?


The tan/wht wire that comes from the C203 connector and goes into the OE Fiero ECM harness travels out to the stock Fiero fuel pump relay and oil pressure sending unit. You can cut this wire inside the car and just wire the ECM up to the end that goes thru the C203 connector and into the chassis wiring harness. Doing this means you don't have to cut the tan/wht wire at the oil pressure sending unit.

The oil pressure sending unit has 3 wires. Orange, Tan, and Tan/wht. The TAN wire that comes out from the center terminal is for the oil pressure gauge on the dash. DO NOT cut this wire.

The Orange wire is 12v + battery power from the F.Pump fuse which is shared with the OE Fiero fuel pump relay via C203 terminal B. After you perform the hot wire fuel pump mod, you can just remove the F.Pump fuse from the fusebox if you aren't going to need power on this circuit for anything else since it will no longer be needed with the hot-wire fuel pump mod.

[This message has been edited by Darth Fiero (edited 10-24-2013).]

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hinesb1890
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Report this Post10-24-2013 09:59 PM Click Here to See the Profile for hinesb1890Click Here to visit hinesb1890's HomePageClick Here to Email hinesb1890Send a Private Message to hinesb1890Edit/Delete MessageReply w/QuoteDirect Link to This Post
Ok thanks, I still find it hard to understand though without directly looking at it. Do you have a picture or can you draw up a really simple diagram? Wiring is just not my expertise which is why I bought everything plug and play.
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