 (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, 10:13 AM
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Life's been good to me so far..... Group: Admin Posts: 15,502 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille 
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You don't have a computer to energize the fuel pump relay.
Remember the diagram of the relay board I was showing you? We have to add a wire to the 4 pin connector to turn on the fuel pump. It should come from the switch under the air flow meter. (IMG:http://www.pelicanparts.com/914/parts/Electrical/914_electric_73E.jpg) Take out relay #75. Make sure that pins #30 and #85 have 12v. If both have 12v, jumper pins 30 and 87, and see if the pump runs. If that works, put the relay back in and ground the front left pin on the 4 pin connector on the relay board (numbered III on the diagram). The pump should run. Now we need to build the harness for the engine. |
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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 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 ClayPerrine ... Oct 19 2005, 12:09 PM 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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