2.3L ('02-'11) 02 Ford ranger ( 2.3 duratec ) no fuel pump

[racingranger90]

Like title states, I have a 02 Ford ranger with 2.3 duratec and 5sp manual, 2wd... and I'm not getting no power to fuel pump.. I have a few rangers I use for parts trucks. that being said..

(Here's a List of things I've done..)

Replaced and checked all fuses and relays.

Took apart the fuse/relay box and checked the wiring for corrosion... All looks brand new.. no corrosion

Replaced ECU with matching pats key ( thinking theirs a short in the original ECU )

Took bed off, replaced fuel pump with another one that I know is good.. I can jump the fuel pump and here it comes on...

I was thinking maybe theirs a bad ground?.. and I was also thinking that maybe the ECU isn't sending ground to pump due to something bad in the ECU wiring?.. cuz, if memory serves.. I believe the ECU tells the pump to kick on via ground wire..

That being said, my question is , which wires from the ECU go to the pump?.. also, if anyone else has a different theory please shime in.. thank you

 

[pjtoledo]

check the cut-out switch on the right floor/firewall area. the wires like to get hot and corrode.
from that cutout switch you should read a few ohms to ground.
the ground is hard wired.
the wire goes from the switch, thru the pump, then on to ground.
if you can jump the pump and turn it on the ground is OK.

 

[racingranger90]

check the cut-out switch on the right floor/firewall area. the wires like to get hot and corrode.
from that cutout switch you should read a few ohms to ground.
the ground is hard wired.
the wire goes from the switch, thru the pump, then on to ground.
if you can jump the pump and turn it on the ground is OK.

Wow!.. I can't believe I didn't even think of that.. thank you.. I plum forgot all about that cutoff switch

 

[racingranger90]

check the cut-out switch on the right floor/firewall area. the wires like to get hot and corrode.
from that cutout switch you should read a few ohms to ground.
the ground is hard wired.
the wire goes from the switch, thru the pump, then on to ground.
if you can jump the pump and turn it on the ground is OK.

Ok, thank you.. how many ohms is it supposed to have?

 

[pjtoledo]

don't remember exactly, but it isn't much. you can jump power to the black/pink,?,,pink/black? which goes directly to the pump.
the wire feeding power to the cutoff gives misleading results, there is a voltage dividing resistor in that monitor circuit.

 

[racingranger90]

don't remember exactly, but it isn't much. you can jump power to the black/pink,?,,pink/black? which goes directly to the pump.
the wire feeding power to the cutoff gives misleading results, there is a voltage dividing resistor in that monitor circuit.

Ok, thank you friend for the reply and help... I will try that

 

[racingranger90]

don't remember exactly, but it isn't much. you can jump power to the black/pink,?,,pink/black? which goes directly to the pump.
the wire feeding power to the cutoff gives misleading results, there is a voltage dividing resistor in that monitor circuit.

Ok, I tried jumping the pink/black wire directly to the battery it arks and the wire starts to get hot fast

 

[pjtoledo]

that sounds like a short exists between that connector and ground.
when that cut out failed in my 2005 a couple years ago I jumped power to the pump there.
ended up replacing the switch and the pigtail w/connector.
what is the resistance to ground on that wire?

EDIT: when jumping power into a circuit it's a good idea to include a fuse in the jumper.

 

[racingranger90]

that sounds like a short exists between that connector and ground.
when that cut out failed in my 2005 a couple years ago I jumped power to the pump there.
ended up replacing the switch and the pigtail w/connector.
what is the resistance to ground on that wire?

When u say that connector, are you talking about the connector for the fuel cut off switch?.. I tried replacing the fuel cut off switch with another one.. it didn't change any

 

[racingranger90]

that sounds like a short exists between that connector and ground.
when that cut out failed in my 2005 a couple years ago I jumped power to the pump there.
ended up replacing the switch and the pigtail w/connector.
what is the resistance to ground on that wire?

The resistance was 1.3

 

[pjtoledo]

I'll check my 2005 tomorrow.
yes, "that connector" is the one on the cutoff switch.
when my cut off switch went bad it wouldn't reset, a new switch didn't fix it, needed the connector/pigtail as the wires
were toasted a bit.

12 volts into 1.3 ohms should give you about 9.2 amps. I'm not sure if that is excessive or not.
is the pump still accessible? unplug it and see if the resistance on that pink/bk wire at the cut off switch changes.
it should go to infinity.

EDIT:
going by my 2005 diagrams, the pink/bk wire goes thru a 16 pin connector C312 under the truck at/near the left
rocker/frame
pin 5


I'm assuming 2002 and 2005 have similar chassis wiring.

 

[racingranger90]

I'll check my 2005 tomorrow.
yes, "that connector" is the one on the cutoff switch.
when my cut off switch went bad it wouldn't reset, a new switch didn't fix it, needed the connector/pigtail as the wires
were toasted a bit.

12 volts into 1.3 ohms should give you about 9.2 amps. I'm not sure if that is excessive or not.
is the pump still accessible? unplug it and see if the resistance on that pink/bk wire at the cut off switch changes.
it should go to infinity.

Ok, thank you.. I will try that.. and yes, I have access to pump ( I took the bed off lol )

 

[racingranger90]

I'll check my 2005 tomorrow.
yes, "that connector" is the one on the cutoff switch.
when my cut off switch went bad it wouldn't reset, a new switch didn't fix it, needed the connector/pigtail as the wires
were toasted a bit.

12 volts into 1.3 ohms should give you about 9.2 amps. I'm not sure if that is excessive or not.
is the pump still accessible? unplug it and see if the resistance on that pink/bk wire at the cut off switch changes.
it should go to infinity.

EDIT:
going by my 2005 diagrams, the pink/bk wire goes thru a 16 pin connector C312 under the truck at/near the left
rocker/frame
pin 5


I'm assuming 2002 and 2005 have similar chassis wiring.

Well I replaced the pigtail and the cutoff switch and it still doesn't have power to the fuel pump

 

[racingranger90]

I'll check my 2005 tomorrow.
yes, "that connector" is the one on the cutoff switch.
when my cut off switch went bad it wouldn't reset, a new switch didn't fix it, needed the connector/pigtail as the wires
were toasted a bit.

12 volts into 1.3 ohms should give you about 9.2 amps. I'm not sure if that is excessive or not.
is the pump still accessible? unplug it and see if the resistance on that pink/bk wire at the cut off switch changes.
it should go to infinity.

EDIT:
going by my 2005 diagrams, the pink/bk wire goes thru a 16 pin connector C312 under the truck at/near the left
rocker/frame
pin 5


I'm assuming 2002 and 2005 have similar chassis wiring.

Ok, thank you.. I will check the c312 under the truck... Yeah I think they are the same...

 

[im_Autistic]

Like title states, I have a 02 Ford ranger with 2.3 duratec and 5sp manual, 2wd... and I'm not getting no power to fuel pump.. I have a few rangers I use for parts trucks. that being said..

(Here's a List of things I've done..)

Replaced and checked all fuses and relays.

Took apart the fuse/relay box and checked the wiring for corrosion... All looks brand new.. no corrosion

Replaced ECU with matching pats key ( thinking theirs a short in the original ECU )

Took bed off, replaced fuel pump with another one that I know is good.. I can jump the fuel pump and here it comes on...

I was thinking maybe theirs a bad ground?.. and I was also thinking that maybe the ECU isn't sending ground to pump due to something bad in the ECU wiring?.. cuz, if memory serves.. I believe the ECU tells the pump to kick on via ground wire..

That being said, my question is , which wires from the ECU go to the pump?.. also, if anyone else has a different theory please shime in.. thank you

hey sorry to bother, but i have the same engine but have a vacuum line disconnected and can't find where it goes. it is the top line off of the vacuum reservoir, the bottom one goes into the fire wall but i can't find anything on where that top line goes. if you can can you look at yours and see where that line goes? thank you