No power to fuel sender
#1
Junior Member
Thread Starter
No power to fuel sender
So after I replaced my fuel pump nothing happened. I then decided to check if I was getting power to the sender unit and no power whatsoever. Any idea what causes this to happened and what can I do to solve the issue thanks?
#2
Rotary Freak
iTrader: (10)
Originally Posted by gearhead7
So after I replaced my fuel pump nothing happened. I then decided to check if I was getting power to the sender unit and no power whatsoever. Any idea what causes this to happened and what can I do to solve the issue thanks?
Jumper the test connector in the engine bay (should be a 2 pin connector with a brown wire and black wire), key to run. Then see what's going on.
From there I would suggest using the FSM to trace through the fuel relay and fuel pump resistor circuits.
#3
Junior Member
Thread Starter
So as I was looking for the black and brown wire this came across. Could this possible burnt my sensor unitAttachment 740373
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#10
Rotary Freak
iTrader: (10)
I'm assuming you have a multimeter, yes?
This is a very simple circuit, did you ever reference the FSM schematic, like I suggested? I have pulled the pertinent page for you.
With the fuel check connector jumpered, the circuit opening relay should make contact and pass voltage on to the fuel pump resistor relay. Check the circuit opening relay for voltage on L/R wire.
If no voltage, check B/W for voltage.
Assuming the circuit opening relay is working, move on to the fuel pump resistor and relay. Check the voltage on the L wire to the pump. If you have no voltage out, but voltage coming in on L/R, you have an issue with this relay as the resistor is always connected. The ECU will short out the resistor for higher pump voltage when needed, but that's besides the point for this scenario.
This is a very simple circuit, did you ever reference the FSM schematic, like I suggested? I have pulled the pertinent page for you.
With the fuel check connector jumpered, the circuit opening relay should make contact and pass voltage on to the fuel pump resistor relay. Check the circuit opening relay for voltage on L/R wire.
If no voltage, check B/W for voltage.
Assuming the circuit opening relay is working, move on to the fuel pump resistor and relay. Check the voltage on the L wire to the pump. If you have no voltage out, but voltage coming in on L/R, you have an issue with this relay as the resistor is always connected. The ECU will short out the resistor for higher pump voltage when needed, but that's besides the point for this scenario.
#12
Rotary Freak
iTrader: (10)
Originally Posted by gearhead7
If the relay is shot. What causes that to happened? Curious to learn and educate myself with these engines.
Perform the tests, collect data, and let's see where you're at.
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krackerx7
2nd Generation Specific (1986-1992)
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02-08-04 07:10 PM