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> jumper wire trick for powering the fuel pump. no run, failure. 74', was Ljet. now carbs
rhodyguy
post Jan 19 2014, 07:44 AM
Post #1


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the haynes current flow diagrams for 74' USA cars leaves me bewildered.

epic failure yesterday while trying to use the 'classic thread' version and eliminate using the + side of the coil to power the pump. made up a small harness to use the stock fuel pump circuit on the existing Ljet harness with the new cb pump. pump doesn't run with the key turned on. connected the pump (disconnected from the harness) to a battery with jumper wires and the pump is functional. does the ECU (brain) have the provision to power or ground the pump? if so, how do i get around that?

1. in the thread i note elliot is using a different pin on the relay board than the one used in andy's picture. is this due to differences in the harness? Ljet vs Djet?

2. in the 'classic' scotty914 makes mention of the pump relay being in the Ljet coil pack. now i'm lost. how does the power or grounding situation work now? i really don't want to go backwards using the coil to power the pump. i will, but prefer not to.

3. can someone verify the coil wires placement for me? 2 black ganged wires to #15(+)? grn condenser and red wire to #1(-)? do connections appear correct in the picture?

4. there is a small yellow wire (pictured) that connects on the relay board. what is its function and what is the correct location?

5. if i were to swap out the Ljet ignition harness for one off of a Djet system would that cure the problem?

carbs are plumbed and ready for the leak test, equal flow/linkage dial in and best lean idle adjustment. until i figure out what the pump problem is i will have to go back to using the coil to power the pump and not have to wait to get started with the tuning.

k


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rhodyguy   jumper wire trick for powering the fuel pump. no run   Jan 19 2014, 07:44 AM
rhodyguy   edited thread to include ? #5.   Jan 19 2014, 08:09 AM
timothy_nd28   Is the dual relay still installed? Also, where di...   Jan 19 2014, 08:18 AM
rhodyguy   pass side of the lower firewall for the pump. i...   Jan 19 2014, 08:23 AM
timothy_nd28   Sure, there is a number of ways to wire this fuel ...   Jan 19 2014, 08:36 AM
rhodyguy   on my 73', prior to andy's instructions, i...   Jan 19 2014, 08:48 AM
rhodyguy   a cup of coffee later...if bridging a couple of po...   Jan 19 2014, 08:55 AM
timothy_nd28   There is a relay bolted to the battery tray, this ...   Jan 19 2014, 09:00 AM
timothy_nd28   Ok, with terminal 3 grounded on the relay board, y...   Jan 19 2014, 09:26 AM
Tom   Kevin, In your second pic, you show a jumper to...   Jan 19 2014, 09:33 AM
timothy_nd28   Kevin, In your second pic, you show a jumper t...   Jan 19 2014, 09:38 AM
rhodyguy   let me know if the pictures don't work for you...   Jan 19 2014, 09:36 AM
rhodyguy   relay added. tim, terminals 2 or 4. 4 being next t...   Jan 19 2014, 09:50 AM
timothy_nd28   relay added. tim, terminals 2 or 4. 4 being next ...   Jan 19 2014, 09:53 AM
timothy_nd28   Going with the dual relay route, you would need to...   Jan 19 2014, 09:52 AM
timothy_nd28   RE: jumper wire trick for powering the fuel pump. no run   Jan 19 2014, 09:56 AM
sixnotfour   L jet only   Jan 19 2014, 10:00 AM
timothy_nd28   Yep, leave the brown wire where it is, I assume th...   Jan 19 2014, 10:03 AM
rhodyguy   tim, the brown wire goes to the ground post forwar...   Jan 19 2014, 10:29 AM
Tom   Kevin, If you are running carbs, you don't ...   Jan 19 2014, 11:05 AM
rhodyguy   i'm heading out to the garage and see what hap...   Jan 19 2014, 11:19 AM
sixnotfour   simpler and cleaner   Jan 19 2014, 11:40 AM
Tom   Kevin, Had another look at the wires to the coi...   Jan 19 2014, 12:55 PM
rhodyguy   with the boxes and boxes of stuff i have, guess wh...   Jan 19 2014, 01:37 PM
timothy_nd28   Sorry Kevin, I ended up leaving to help a family ...   Jan 19 2014, 09:24 PM
rhodyguy   sourced a 75' ignition harness and the pump ru...   Jan 23 2014, 02:42 PM


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