external electric fuel pump install questions
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external electric fuel pump install questions
I have a fuel pump I want to install and am hoping for electrical advice. I want to hook this thing up on a switch inside the cabin to be used as kind of a security device, but I am hoping I can wire it into the ignition as well.... I want the pump to activate when the ignition is turned on but only if the (hidden from view) switch is in the "on" position. Not sure if all this is possible.
I have heard I ought to utilize a relay to avoid voltage loss at the pump. I have never hooked up a relay to anything before although I have heard of them being used. This system is being installed on a 1967 F250.
Any expert advice is appreciated!!!
JIM
I have heard I ought to utilize a relay to avoid voltage loss at the pump. I have never hooked up a relay to anything before although I have heard of them being used. This system is being installed on a 1967 F250.
Any expert advice is appreciated!!!
JIM
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From: Virginia
If the pump is not very large, you do not need a relay. Do you know how many amps the pump uses?
If it's not many amps, you can come right out of the fuse box with a wire that is hot in run or start only, and then run that to your switch, and then from the switch to the pump. You can also get this power from the ignition switch also if it's easy to get to, and then a fuse, then the security switch and then the pump.
If it's not many amps, you can come right out of the fuse box with a wire that is hot in run or start only, and then run that to your switch, and then from the switch to the pump. You can also get this power from the ignition switch also if it's easy to get to, and then a fuse, then the security switch and then the pump.
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If the pump is not very large, you do not need a relay. Do you know how many amps the pump uses?
If it's not many amps, you can come right out of the fuse box with a wire that is hot in run or start only, and then run that to your switch, and then from the switch to the pump. You can also get this power from the ignition switch also if it's easy to get to, and then a fuse, then the security switch and then the pump.
If it's not many amps, you can come right out of the fuse box with a wire that is hot in run or start only, and then run that to your switch, and then from the switch to the pump. You can also get this power from the ignition switch also if it's easy to get to, and then a fuse, then the security switch and then the pump.
The company recommends a 15a in line fuse to the power side of the pump. I imagine it has a significant draw...
JIM
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From: Virginia
Ok, come directly off the battery with a 12 guage wire, very short, and then mount a circuit breaker or fuse, 15 amp. Then from the fuse or circuit breaker run over to a bosch type relay mounted under the hood nearby. Here's a diagram of the relay;
Hook the wire from the fuse or circuit breaker to term 30. Then still using 12 gauge wire, hook another one to term 87, and then run this down to the pump. Make sure the pump is grounded. That's all your large power wiring.
For the control, hook a small wire, 16 or 18 gauge will do, to term 85, and run this to a good ground somewhere around the relay, possibly the relay mounting bolt if it's screwed to a good grounded piece of metal. Then take another small 16 or 18 piece of wire and hook it to term 86. Run this all the way into the cab to your security switch. I would put a piece of vacuum line around the wire where it goes through the firewall to protect it.
From the other side of your security switch run the same gauge wire to the fuse box or keyswitch, making sure it's hot in run and start only.
Hook the wire from the fuse or circuit breaker to term 30. Then still using 12 gauge wire, hook another one to term 87, and then run this down to the pump. Make sure the pump is grounded. That's all your large power wiring.
For the control, hook a small wire, 16 or 18 gauge will do, to term 85, and run this to a good ground somewhere around the relay, possibly the relay mounting bolt if it's screwed to a good grounded piece of metal. Then take another small 16 or 18 piece of wire and hook it to term 86. Run this all the way into the cab to your security switch. I would put a piece of vacuum line around the wire where it goes through the firewall to protect it.
From the other side of your security switch run the same gauge wire to the fuse box or keyswitch, making sure it's hot in run and start only.
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JIM
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From: Virginia
Mounted up high on the fender or the firewall, it shouldn't have a problem. There are other things around there that shouldn't get wet also, like the alternator regulator and the ignition wires on the engine.
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Cool Dave. Thanks. Tried to buy the relay yesterday at Loper's but they disn't have the relay/harness combo and the fellow encouraged me to find the set rather than just wiring it with female connectors. Said it would be cleaner install and less chance of something touching and shorting or popping off. Fry's sells a Bosch relay harness for $3.99 and I imagine any parts house oughta have the relay available. Actually Loper's had 'em, just not Bosch or Tyco brand.....
I DID manage to get the plumbing for the addition.... The Edelbrock high performance mechanical pump would have been cheaper....
I DID manage to get the plumbing for the addition.... The Edelbrock high performance mechanical pump would have been cheaper....
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