need help finding relay
Thread Starter
Instructor
Joined: Dec 2009
Posts: 139
Likes: 0
From: Wadley Georgia
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 42
From: Baltimore, MD USA
Fuel Pump Relay 1 is on the passenger side front edge of the dash.
Fuel Pump Relay 2 is located below the dash cluster and is only used by the ZR1.
You need to remove the plastic panel with the foot well lamp
to get to Fuel Pump Relay 1.
All the relays in that area are the same so you can swap them around.
Fuel Pump Relay 2 is located below the dash cluster and is only used by the ZR1.
You need to remove the plastic panel with the foot well lamp
to get to Fuel Pump Relay 1.
All the relays in that area are the same so you can swap them around.
Last edited by Hooked on Vettes; Feb 4, 2012 at 05:50 PM.
Thread Starter
Instructor
Joined: Dec 2009
Posts: 139
Likes: 0
From: Wadley Georgia
Fuel Pump Relay 1 is on the passenger side front edge of the dash.
Fuel Pump Relay 2 is located below the dash cluster and is only used by the ZR1.
You need to remove the plastic panel with the foot well lamp
to get to Fuel Pump Relay 1.
All the relays in that area are the same so you can swap them around.
Fuel Pump Relay 2 is located below the dash cluster and is only used by the ZR1.
You need to remove the plastic panel with the foot well lamp
to get to Fuel Pump Relay 1.
All the relays in that area are the same so you can swap them around.
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 42
From: Baltimore, MD USA
The ECM applies 12 volts to the Dark Green/White wire to turn on the
fuel pump relay.
You didn't say what your problem is. If the fuel pump runs
with the ignition off, it could be the oil pressure switch/sender behind the
distributor on the driverside is bad.
It has two functions. It is an oil pressure sender and it also
has contacts that close if the oil pressure is above 4 psi. When the
contacts close, 12 volts from an Orange wire (hot at all times) passes
through the switch and provides 12 volts to a Red wire that provides
12 volts to the fuel pump fuse and the fuel pump will run. This is a
backup source in case the Fuel Pump relay fails.
If the switch fails in the closed position, the fuel pump will run
all the time. Current path is in Blue for the oil pressure switch.
fuel pump relay.
You didn't say what your problem is. If the fuel pump runs
with the ignition off, it could be the oil pressure switch/sender behind the
distributor on the driverside is bad.
It has two functions. It is an oil pressure sender and it also
has contacts that close if the oil pressure is above 4 psi. When the
contacts close, 12 volts from an Orange wire (hot at all times) passes
through the switch and provides 12 volts to a Red wire that provides
12 volts to the fuel pump fuse and the fuel pump will run. This is a
backup source in case the Fuel Pump relay fails.
If the switch fails in the closed position, the fuel pump will run
all the time. Current path is in Blue for the oil pressure switch.
Last edited by Hooked on Vettes; Feb 5, 2012 at 08:53 AM.
Thread Starter
Instructor
Joined: Dec 2009
Posts: 139
Likes: 0
From: Wadley Georgia
My problem is the fuel pump isnt priming like it did before it was put into storage. This is causing the car not to start. I was hoping it would be the relay because that is much easier to get to than the fuel pump.
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 42
From: Baltimore, MD USA
If the ECM can't control the fuel pump relay
if you keep cranking the engine, eventually
4 psi of oil pressure will close the oil switch
and the fuel pump will get 12 volts from the
oil switch.
It just takes extended cranking time before
the engine will start.
Also under the hood is a wiring harness near the power
brake booster. There is a single Red wire with a female
spade lug. If you apply 12 volts from the Battery
to this terminal the fuel pump should run all
the time even with the ignition off.
If the fuel pump doesn't run most likely the fuel pump is bad.
if you keep cranking the engine, eventually
4 psi of oil pressure will close the oil switch
and the fuel pump will get 12 volts from the
oil switch.
It just takes extended cranking time before
the engine will start.
Also under the hood is a wiring harness near the power
brake booster. There is a single Red wire with a female
spade lug. If you apply 12 volts from the Battery
to this terminal the fuel pump should run all
the time even with the ignition off.
If the fuel pump doesn't run most likely the fuel pump is bad.
Last edited by Hooked on Vettes; Feb 5, 2012 at 02:15 PM.
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