12v to a good fuel pump but it doesn't work...

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  #1  
Old 06-19-05, 07:19 PM
Barry (Or)
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12v to a good fuel pump but it doesn't work...

'93 Toyota Corolla, 5 speed, 4 door.

There is 12v to the connector at the fuel pump but it doesn't work. Seems like the fuel pump would be bad but when we run 12v from an external supply it works!

We jumpered across the main EFI relay but that didn't help. Where is the "Curcuit Opening Relay" located?

Any help would be greatly appreciated.
 
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  #2  
Old 06-20-05, 02:32 AM
Join Date: Jun 2002
Location: Long Island, NY
Posts: 1,531
Have seen on those where the holder that the fuel pump sits in is bad. The terminal where it passes through the holder becomes bad.

If you have power(blue/black stripe) ground (white/black stripe) and a know good pump the holder is ng.
 
  #3  
Old 06-20-05, 05:02 AM
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Join Date: Aug 2003
Location: Cape Cod
Posts: 4,320
Originally Posted by Barry (Or)
Replaced part of the fuel pump assembly - just the pump and the screen-filter. (Didn't replace the whole fuel pump assembly.)

Originally Posted by toyotaman11769
Have seen on those where the holder that the fuel pump sits in is bad. The terminal where it passes through the holder becomes bad.

Wow, I didn't know the holders could go bad
That's good to know
I often replace just the pump
 
  #4  
Old 06-20-05, 07:01 AM
Barry (Or)
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We tested the terminal inside and...

toyotaman11769,

Thank you for your reply!

When we put external power to the pump we went through the connector at the top of the assembly while the pump was installed into the tank. It worked that way, so it seems like we tested the terminal where it passes through the holder.

Is it possible that the pump assembly could be bad even though we tested it like that?

What about having voltage at the pump but not enough current to drive it? What could cause that?

Thanks again.
 
  #5  
Old 06-20-05, 07:15 AM
Join Date: Jun 2002
Location: Long Island, NY
Posts: 1,531
Do you have power(blue/black stripe) ground (white/black stripe) at those wires?

The circuit opening relay is behind the console front on the left side.
 
  #6  
Old 06-20-05, 04:29 PM
Barry (Or)
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Fixed...and thank you!

Thanks for all the help!

The blu-blk wire from the circuit opening relay showed higher resistance than it should have. Tracked it down to the connection where the blue-black fuel pump wire is connected to the blue-black wire between the circuit opening relay and the data link connector. The wire to the data link connector is the through wire and the fuel pump is the one that is spliced in. We believe that it is that splice that is bad - even though we don't know where the splice is physically located. Anyway it is Ok enough to show voltage but bad enough to not allow current to drive the pump.

Since we didn't know where the splice was we just made another splice and ran another wire between the circuit opening relay and the pump. And I drove it home!

Thanks again - especially to toyotaman11769. This really is a great website for getting help.
 
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