Electric Fuel Pump Question
Thread Starter
Melting Slicks
Joined: Jun 2001
Posts: 2,429
Likes: 14
From: CA
Electric Fuel Pump Question
I'm installing an electric pump today on my truck. How do I wire it into the oil pressure switch so it disables if the oil pressure light illuminates?
I'm trying to avoid a potential fire hazzard if the engine quits, but the key remains on.
I know there is a way to do it without buying their oil press switch.
Thanks in advance
I'm trying to avoid a potential fire hazzard if the engine quits, but the key remains on.
I know there is a way to do it without buying their oil press switch.
Thanks in advance
Race Director
Joined: Nov 1999
Posts: 10,643
Likes: 8
From: Foxfield CO 1970 Convertible
Originally Posted by stpman
I would have the sensor power a relay and use the relay contacts to power the fuel pump and oil pressure light.
Steve
Steve
Racer
Joined: May 2004
Posts: 301
Likes: 2
From: Boca Raton Fl
I have mine on the oil pressure switch and it works great.
The switch has 3 leads on it
One gets power from key on
One get power from starter during cranking
One goes to the pump to give it power needed
No relays...just like instructions
Works like a champ!
The switch has 3 leads on it
One gets power from key on
One get power from starter during cranking
One goes to the pump to give it power needed
No relays...just like instructions
Works like a champ!
Thread Starter
Melting Slicks
Joined: Jun 2001
Posts: 2,429
Likes: 14
From: CA
Originally Posted by Z-man
I don't know any other way around it without a relay. But isn't that what the oil pressure sensors are anyway? They are only $12 from Jegs...
I have the relay kit with the pump. I just wanted to see if anyone has an idea to wire it into the oil press sender. The problem is that the factory sender only turns on when oil pressure drops (when the dash idiot lights come on) If it did the opposite it wouldn't be a problem. I need to hook it up so when the dash lights come on, it opens the circuit.
Hmmmm.
Race Director
Joined: Nov 1999
Posts: 10,643
Likes: 8
From: Foxfield CO 1970 Convertible
Oops - forgot it wasn't a Vette engine.
Most common relays (and probably the one in the kit) have two options for wiring the high voltage side - Normally open (NO) and normally closed (NC). Assuming that the current used to light up the idiot light is sufficient, get a relay and wire it up so that the NC portion of the circuit is used. When power is applied to the low voltage side, the relay will open and cut off the power to the pump.
Note that this will only work when the key is on (the same as when the idiot light would work). Once they key is off, power to the pump through the relay will be restored.
Most common relays (and probably the one in the kit) have two options for wiring the high voltage side - Normally open (NO) and normally closed (NC). Assuming that the current used to light up the idiot light is sufficient, get a relay and wire it up so that the NC portion of the circuit is used. When power is applied to the low voltage side, the relay will open and cut off the power to the pump.
Note that this will only work when the key is on (the same as when the idiot light would work). Once they key is off, power to the pump through the relay will be restored.
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
Originally Posted by 71coupe
There's only one area that I can tap into, & I'm not sure if I can get a T to fit where the sender nomally goes.
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Thread Starter
Melting Slicks
Joined: Jun 2001
Posts: 2,429
Likes: 14
From: CA
Originally Posted by Z-man
Oops - forgot it wasn't a Vette engine.
Most common relays (and probably the one in the kit) have two options for wiring the high voltage side - Normally open (NO) and normally closed (NC). Assuming that the current used to light up the idiot light is sufficient, get a relay and wire it up so that the NC portion of the circuit is used. When power is applied to the low voltage side, the relay will open and cut off the power to the pump.
Note that this will only work when the key is on (the same as when the idiot light would work). Once they key is off, power to the pump through the relay will be restored.
Most common relays (and probably the one in the kit) have two options for wiring the high voltage side - Normally open (NO) and normally closed (NC). Assuming that the current used to light up the idiot light is sufficient, get a relay and wire it up so that the NC portion of the circuit is used. When power is applied to the low voltage side, the relay will open and cut off the power to the pump.
Note that this will only work when the key is on (the same as when the idiot light would work). Once they key is off, power to the pump through the relay will be restored.
How do I wire it so it is NC? Also, I have a few other relays I can add in.
BTW, The truck (Isuzu 3/4 ton) was fuel injected, I'm converting it to a carb. It doesn't have a mech pump option.
Last edited by 71coupe; Nov 27, 2004 at 12:58 PM.