HOW TO: run the fuel pump for carb conversions, the easy solution! |
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HOW TO: run the fuel pump for carb conversions, the easy solution! |
SirAndy |
Feb 25 2005, 06:41 PM
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#1
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Resident German Group: Admin Posts: 41,854 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
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) |
mtndawg |
Apr 15 2019, 11:20 AM
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#2
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Member Group: Members Posts: 414 Joined: 26-January 09 From: Granite Bay, Ca Member No.: 9,985 Region Association: None |
Hi, resurrecting a classic. I have a 1975 and the previous owner did not have the car set up to shut off the fuel pump when the engine is off. I’ve made a short wire to ground from the tab on the relay board, just like the red wire in the photo. Under my fuel tank in the front, the original wires are powering a pierburg pump. I’m not clear what I need to change in the wiring connectected to the pump to make this work?
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