 (UN)bypassing a fuel pump relay.., going from Carbs to FI. |
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| DougC |
 Oct 19 2005, 09:24 AM
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Senior Member  Group: Members Posts: 949 Joined: 6-July 04 From: Dallas, TX Member No.: 2,307  |
PO of my car ('73 w/D-jet) had installed carbs and had the fuel pump under the gas tank. The FP was wired directly to the #8 fuse on the panel, and the ground attached at some point above the fuse panel I believe. Anyway I want to go back to having the FP run through the relay on the board in the engine compartment since I'll be using fuel injection. So I disconnected the wire going to #8 fuse (+ FP wire) and made a connecting wire to the Black/Red wire at the front right hand side of the engine compartment which was originally used for the FP. This didn't work to energize the FP at all, nothing when I turned the key and I'm not sure why. Can anyone tell me what I'm missing? There is a FP relay in the board that I believe is good.
Doug C |
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| ClayPerrine |
Oct 19 2005, 12:09 PM
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Life's been good to me so far..... Group: Admin Posts: 15,514 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille 
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You are correct, the air flow meter switch will provide a ground to the relay. But ath is what it is supposed to do. The relay in the diagram provides ground for the factory fuel pump relay on the relay board. When the diagram's relay is not energized, the air flow meter switch provides ground for Pin III on the relay board. When the car is cranking, power is supplied to pins II and IV on the 4 pin connector. Pin IV provides power to the thermo time switch and cold start injector, and pin II provides power to the diagrams' relay. The diagram's relay closes, and it bypasses the air flow meter switch and provides ground for the fuel pump relay. Now does that make sense????? (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif) |
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Posts in this topic
DougC (UN)bypassing a fuel pump relay.. Oct 19 2005, 09:24 AM
SirAndy Oct 19 2005, 10:07 AM ClayPerrine You don't have a computer to energize the fuel... Oct 19 2005, 10:13 AM DougC If that works, put the relay back in and ground th... Oct 19 2005, 10:41 AM ClayPerrine Doug,
It's not that simple. You have to have ... Oct 19 2005, 11:27 AM ClayPerrine Here's a wiring diagram for CIS on a 914. Oct 19 2005, 11:55 AM lapuwali I looked again, you're right. Duh on my part.... Oct 19 2005, 12:15 PM ClayPerrine You could leave the relay out, but the car would n... Oct 19 2005, 12:20 PM
DougC Clay - I will take those measurements this evening... Oct 19 2005, 12:39 PM |
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