EP381 Amperage?

[94onthefloor]

Anyone know a general amperage for the EP381 fuel pump?

 

[Erik the Awful]

I plugged it into the stock TBI fuel pump harness and haven't had any problems.

 

[Schurkey]

7-ish amperes.

I use an oscilloscope with a low-amperage probe to verify fuel pump power before replacing a suspected-bad pump. Using a 'scope, I can check the amperage draw of each individual armature bar on the pump motor. Once I determine how many armature bars the motor has, I can also calculate the RPM of the motor.

GM tends to use under-sized wire to power the pump. Common to have 2--3 volts of voltage drop between the supply-side wiring and the ground-side wiring, combined. So the pump often runs on 11--12 volts when the alternator is charging at 14+ volts.

 

[L31MaxExpress]

7-ish amperes.

I use an oscilloscope with a low-amperage probe to verify fuel pump power before replacing a suspected-bad pump. Using a 'scope, I can check the amperage draw of each individual armature bar on the pump motor. Once I determine how many armature bars the motor has, I can also calculate the RPM of the motor.

GM tends to use under-sized wire to power the pump. Common to have 2--3 volts of voltage drop between the supply-side wiring and the ground-side wiring, combined. So the pump often runs on 11--12 volts when the alternator is charging at 14+ volts.

Which is why I have had a Racetronix Hotwire, matching bulkhead connector and matching in-tank harness on my Van for going on 10 years. The 10 ga power feed wire connects directly to the alternator output stud and it also has a 10ga ground connection. The stock pump gets full voltage. I also added a remote sense wire to the regulator and tied it to the underhood fusebox input. I have full voltage at the fuse box with everything on. Might be a little high at the battery but since my van is not driven daily does not seem to hurt anything.

 

[94onthefloor]

7-ish amperes.

I use an oscilloscope with a low-amperage probe to verify fuel pump power before replacing a suspected-bad pump. Using a 'scope, I can check the amperage draw of each individual armature bar on the pump motor. Once I determine how many armature bars the motor has, I can also calculate the RPM of the motor.

GM tends to use under-sized wire to power the pump. Common to have 2--3 volts of voltage drop between the supply-side wiring and the ground-side wiring, combined. So the pump often runs on 11--12 volts when the alternator is charging at 14+ volts.

I'm trying to find out if the amperage is low enough to splice into the Terminator X Max fuel pump sending wire

 

[94onthefloor]

Which is why I have had a Racetronix Hotwire, matching bulkhead connector and matching in-tank harness on my Van for going on 10 years. The 10 ga power feed wire connects directly to the alternator output stud and it also has a 10ga ground connection. The stock pump gets full voltage. I also added a remote sense wire to the regulator and tied it to the underhood fusebox input. I have full voltage at the fuse box with everything on. Might be a little high at the battery but since my van is not driven daily does not seem to hurt anything.

I'm trying to find out if the amperage is low enough to splice into the Terminator X Max fuel pump sending wire

 

[PlayingWithTBI]

I'm trying to find out if the amperage is low enough to splice into the Terminator X Max fuel pump sending wire

It'd be real simple to wire in a relay.

 

[94onthefloor]

It'd be real simple to wire in a relay.

Very true I didn't think of that