HOW TO: run the fuel pump for carb conversions, the easy solution! Options

[SirAndy]

Back by popular demand, Sir Andy's "HOW TO" series presents:

HOW TO: Run the fuel pump for carb conversions

There are numerous tech. articles out there that cover this issue.
When you switch from the stock FI to carburetors, you have to install a low pressure carb fuel-pump.
But, since the FI fuel pump is controlled by the FI brain, removing the brain means the wires to the fuel pump won't give you 12V ...

There are a lot of "band-aid" solutions out there, some people remove the pump relay and add a jumper there, others even run the pump off the coil!
While all those solutions work (more or less) they all lack one thing, you're now running the pump without a relay! (and in case of the coil, without fuse as well)

The best (and also easiest!) solution is to trick the relayboard into believing that the FI-Brain is still connected ...

And it's as simple as connecting one wire from the 4-prong FI connector to ground.
You keep the stock fuel pump relay and fuse and you use the stock wires to power the new fuel pump.
Below you'll see 2 pictures showing how to attach the wire. on the pump side, simple make 2 more extension wires with "male" connectors on one end and plug them into the stock (roundish) plug for the stock fuel pump.
No need to hack into the original harness!!!

This install is clean and simple! (and cheap!)

In the pics below the thick red wired replaces the FI-Brain ...
(IMG:style_emoticons/default/smash.gif) Andy

(IMG:http://www.914world.com/bbs2/uploads/post-11-1109378319.jpg)

(IMG:http://www.914world.com/bbs2/uploads/post-11-1109378417.jpg)

[SKL1]

Just got two of those inertia fuel cut off switches from Summit Racing- supposed for a Ford and look a little different than the ones in this thread. This was discussed on a thread a couple weeks ago I haven't been able to relocate on the search function.

They came with no instructions but I put the switch in the front trunk near the pump next to the spare tire on my '73. I luckily mounted it vertically (as instructed in the switch on this thread) and "assume" that is correct. I have sent a question to customer service at Summit to confirm.

Need to install it on my '71 but will wait to confirm that this model is also supposed to be mounted vertically.

Will be some piece of mind, though I must admit I've been driving the '71 with carbs without the switch for over 15 years! Luckily no issues but I don't drive it a lot...