Technical Tips > Post 84
I think we fixed the problem!
Jethro:
--- Quote ---Originally posted by 87Z51
Switch is intended to keep pump running if relay drops out , not as oil pressure safety device.
At 5 lb setting engine would be dead before switch drops out.
Check connection on pump relay.Common problem for insulation to go bad as well as bad or intermitant connections.
Jumper orange to tan / white at relay plug and pump should run.Easier to get to than oil switch behind dist.
Put a volt meter on the green / white to earth and see if it gets 12V when the key is turned on.(confirms prime signal from computer )
As a note if relay is not operating , in a car with a decent battery, cranking should bring the oil pressure up enough to close oil pressure switch and operate pump.
--- End quote ---
Sorry but can I get you to explain a little easier? What do you want me to try? I don't understand what to mean "jumper orange to Tan" ? I can't find the tan wire?
Jethro
87Z51:
When you find the fuel pump relay (should be on firewall beside dist) there are 4 wires in the relay plug.Two thicker than the other two.
Orange is the power from the battery
Tan / wht is the supply to the pump .May be different colour.
The two thicker wires are the pump in / out wires
Green / wht is the operating signal from the computer
Blk / wht is the earth
The computer puts 12V on the green /wht to close the relay and let power go from the batterty to the pump.
By jumpering the two thick wires you are bypassing the relay and checking pump only operation.
Jethro:
O.K. Thanks will try this this weekend!
Jeff:ado
Jethro:
--- Quote ---Originally posted by 87Z51
When you find the fuel pump relay (should be on firewall beside dist) there are 4 wires in the relay plug.Two thicker than the other two.
Orange is the power from the battery
Tan / wht is the supply to the pump .May be different colour.
The two thicker wires are the pump in / out wires
Green / wht is the operating signal from the computer
Blk / wht is the earth
The computer puts 12V on the green /wht to close the relay and let power go from the batterty to the pump.
By jumpering the two thick wires you are bypassing the relay and checking pump only operation.
--- End quote ---
Dose anyone know what relay is the Fuel pump Relay? I've got Four Relays side by side starting near distributor , all of them in a tight position to get to? I don't want to short something else out?
These are the # 's on them:
7299 - 14089936
0339 - 14089936
5320 - 14089936
The last has #14103304 marked on it
all fours show the same value i.e:
E C
D A
F
:fun
87Z51:
#14103304 should be pump ( is on mine anyway )
others are fan and MAF burn off.
all fours show the same value i.e:
E C
D A
F
They are the pin positions
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