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College Student
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Discussion Starter #1
Where is a good place to tap into for power when the key is on only?
I read somewhere that the old fuel bowl heater wire could be used.
Where is a better place to tap into? I dont have very much experience playing electrician messing around in the fuse boxes...
Thanks.
 

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Project Shamu
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I tapped into a fuse into the underhood fuse box, i forget the exact number, but it was the only one that had power while key on and while cranking, kept the pump on the entire time. Just get a test light out and start checking. After I tapped into the fuse, I mounted my relay right on the firewall next to it.
 

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The #22 fuse under the hood powers the fuel heater and only has power with the key on.

However I would use the wire from the fuel heater connection on the filter housing just because it is already there and won't be used when you convert over to Efuel.
 

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College Student
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Discussion Starter #4
That what I was thinking Bugman.

I'll just run it to wherever I place the relay and it should be good. Then just hook the other 3 to power, the pump and the ground.

If all goes well, it should be running by tomorrow.

Will I run into a problem of priming it, or will I just have to cycle the key a few times?
 

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That what I was thinking Bugman.

I'll just run it to wherever I place the relay and it should be good. Then just hook the other 3 to power, the pump and the ground.

If all goes well, it should be running by tomorrow.

Will I run into a problem of priming it, or will I just have to cycle the key a few times?

Just turn the key on and let the pump run for a little bit. You will hear the sound change as the air is pushed through the system. Eventually the air will make it back to one of the tanks through the return line and you'll be good to go.

Why are you adding a relay?
 

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College Student
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Discussion Starter #6
I read on a lot of write ups that people had put in relays. So I added one in. Not sure if it really needs one, but it has one now. so far everything is working. I acidentialy had the pump put in wrong. had a 50/50 shot and didnt get it right. Pulled the filters and realized that it was sucking air out of the head going to the motor. flipped it around and cycled it a few times until it flowed through the water separator and pump. Then put in place the main filter and waited for it to prime for a while giving it a few cycles.Then once primed, adjusted the FPR until around 65psi. Started it up and checked for leaks.

What is a good recommended fuel pressure to run at?
 

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I read on a lot of write ups that people had put in relays. So I added one in. Not sure if it really needs one, but it has one now. so far everything is working. I acidentialy had the pump put in wrong. had a 50/50 shot and didnt get it right. Pulled the filters and realized that it was sucking air out of the head going to the motor. flipped it around and cycled it a few times until it flowed through the water separator and pump. Then put in place the main filter and waited for it to prime for a while giving it a few cycles.Then once primed, adjusted the FPR until around 65psi. Started it up and checked for leaks.

What is a good recommended fuel pressure to run at?
Relay or no relay, as long as it all works that's all that really matters. Maybe someone can chime in about the benefit of running a relay.

I have always read/heard that the fuel pressure should be set at 60psi. It might be different for different applications.
 

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Project Shamu
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A relay is always very smart, I'm running a larger than normal relay that will eventually power twin SD pumps. Running off just the fuel bowl heater might overload the wire too, who knows if the wire is thick enough, or if the power source can supply the load.
 

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It isn't the size of the wire but the amperage of the load. I am sure that a fuel pump will draw less than the fuel heater but a relay that is controlled by a key on source like the heater wire and a fused load wire going to the pump is always smart

Sent from my SM-J737V using Tapatalk
 

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College Student
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Discussion Starter #10
The fuel heater wire should just be providing the power to operate the relay. I don't imagine it will draw very much current. The main power is coming from the battery which also has a 25AMP fuse between the two as well.
 

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Project Shamu
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The fuel heater wire should just be providing the power to operate the relay. I don't imagine it will draw very much current. The main power is coming from the battery which also has a 25AMP fuse between the two as well.
Correct, it's just a signal to the relay, but you shouldn't be powering the fuel pump directly off that wire.
 

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Totally what Lt Dan said, use the fuel heater wire as a trigger power source for the Relay only and not direct to pump. Also need to put a fuse in the main power wire to the pump. Meaning inline between the Battery and Pump, if you ever have a pump fail and short out or wire harness short the fuse will pop rather then wires getting hot and catching on fire....
j
 
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