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battery drains with fuel pump fuse in by Grantman
Started on: 05-31-2014 10:44 PM
Replies: 10 (316 views)
Last post by: Grantman on 06-06-2014 10:38 PM
Grantman
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Report this Post05-31-2014 10:44 PM Click Here to See the Profile for GrantmanClick Here to Email GrantmanSend a Private Message to GrantmanEdit/Delete MessageReply w/QuoteDirect Link to This Post
Throwing this out there in case anyone has a suggestion, my car (3800SC) will drain the battery with the fuel pump fuse left in overnight. pull the fuse out and no battery drain. New fuel pump put in because the old one stopped working (didn't change the battry drain problem). The typical oil pressure switch (3 wire) was replaced when a new gauge (autometer) was put in so there is a oil pressure switch installed with only one wire going to the gauge. so it seems as though that should rule out the typical oil pressure switch malfunction causing the drain by keeping the pump running.
Problem appears to be focused in the pump circuit because of the fuse situation already mentioned. Other than maybe some loose pins on the C203 where else does one look?

below is a picture of the oil pressure switch that is located next to to the oil filter.


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Report this Post05-31-2014 11:51 PM Click Here to See the Profile for GoliathSend a Private Message to GoliathEdit/Delete MessageReply w/QuoteDirect Link to This Post
ummmm that is a oil pressure sender for your gauge not the switch.

If that is connected to you fuel pump you would have a small drain all the time and the fuel pump would not work.

Also the tag on the wire says C203 E is for the gauge.
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phonedawgz
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Report this Post06-01-2014 12:01 AM Click Here to See the Profile for phonedawgzClick Here to visit phonedawgz's HomePageClick Here to Email phonedawgzSend a Private Message to phonedawgzEdit/Delete MessageReply w/QuoteDirect Link to This Post
When the new oil pressure sender was installed were the two unused wires (Orange/Black and Tan/White) NOT spliced together? They should not be spliced together.

Does the fuel pump run with the fuel pump relay unplugged? It should not.

Can you hear the fuel pump run when the fuse is in key off?

Remove the fuse and insert an amp meter in place. What is the current draw key off? It should be zero. If not does the current go to zero with the fuel pump relay unplugged?n Does the amp meter go to zero with C502 (the fuel tank connector) unplugged?

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Grantman
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Report this Post06-01-2014 08:45 AM Click Here to See the Profile for GrantmanClick Here to Email GrantmanSend a Private Message to GrantmanEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks for suggestions, will be a couple days before I can check them out. Will report what I find.

Out of curiosity tho, if the old 3 wire connector for a 88 oil sender/ switch is left unconnected is that an issue?

[This message has been edited by Grantman (edited 06-01-2014).]

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phonedawgz
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Report this Post06-01-2014 12:13 PM Click Here to See the Profile for phonedawgzClick Here to visit phonedawgz's HomePageClick Here to Email phonedawgzSend a Private Message to phonedawgzEdit/Delete MessageReply w/QuoteDirect Link to This Post
Nope that should be just fine as long as the connector isn't touching something or wet.

The two outside wires on the connectors were the power in feed (Orange/'Black or Orange) and the feed onto the pump (Tan//White or Tan)

The center wire was the one that went to the Fiero gauge.
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Grantman
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Report this Post06-01-2014 04:50 PM Click Here to See the Profile for GrantmanClick Here to Email GrantmanSend a Private Message to GrantmanEdit/Delete MessageReply w/QuoteDirect Link to This Post
I'm getting about 3.38-3.42 with relay hooked up or unplugged. Pump doesn't run with relay unplugged.
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phonedawgz
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Report this Post06-01-2014 07:05 PM Click Here to See the Profile for phonedawgzClick Here to visit phonedawgz's HomePageClick Here to Email phonedawgzSend a Private Message to phonedawgzEdit/Delete MessageReply w/QuoteDirect Link to This Post
3.82 Amps ? with the relay unplugged and nothing connected to the oil pressure sender?

You should be reading zero.

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Grantman
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Report this Post06-01-2014 08:02 PM Click Here to See the Profile for GrantmanClick Here to Email GrantmanSend a Private Message to GrantmanEdit/Delete MessageReply w/QuoteDirect Link to This Post
exactly. haven't disconnected C502 yet and tried it. Need to try that next. still wondering if something has pulled apart at C203. PO said everything worked fine for the 1st year to year and a half and then the battery draining started.
what I thought was the oil pressure wires is not, so I need to find those to see if they were somehow wired together or left exposed when the gauges were switched.
wires somewhere must be touching that shouldn't be touching.
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phonedawgz
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Report this Post06-01-2014 10:48 PM Click Here to See the Profile for phonedawgzClick Here to visit phonedawgz's HomePageClick Here to Email phonedawgzSend a Private Message to phonedawgzEdit/Delete MessageReply w/QuoteDirect Link to This Post
You are measuring this current with the key off right?

So start unplugging things and see where the current drops to zero.

C502
Oil Pressure Switch
Fuel Pump Relay
C203 (don't try till trying the first three)
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Grantman
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Report this Post06-01-2014 10:53 PM Click Here to See the Profile for GrantmanClick Here to Email GrantmanSend a Private Message to GrantmanEdit/Delete MessageReply w/QuoteDirect Link to This Post
Key is off. Thanks much for walking me through the process.
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Grantman
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Report this Post06-06-2014 10:38 PM Click Here to See the Profile for GrantmanClick Here to Email GrantmanSend a Private Message to GrantmanEdit/Delete MessageReply w/QuoteDirect Link to This Post
unplugged the C502, still shows big draw at the fuse box. bigger priority right now is my other thread, car stutters and having a PO300 random misfire on cyl 3 and 6.
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