jumper wire trick for powering the fuel pump. no run, failure. 74', was Ljet. now carbs |
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jumper wire trick for powering the fuel pump. no run, failure. 74', was Ljet. now carbs |
rhodyguy |
Jan 19 2014, 07:44 AM
Post
#1
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,092 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
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 Attached thumbnail(s) |
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