Results 1 to 3 of 3

Thread: 1227747 and Fuel Pump questions

  1. #1
    Fuel Injected!
    Join Date
    Oct 2014
    Posts
    43

    1227747 and Fuel Pump questions

    On my 1227747, I get power to the fuel pump relay and the pump runs for 2 seconds during ignition on. However when I go to crank the engine, the relay is no longer energized. Looks like pin A1 is no longer sending power to the relay when I try to crank.

    Can anyone tell me what the ECU is checking if anything before energizing the relay coil on A1 during cranking?

    I likely have something else wire wrong, but not sure where to start looking. For example is it checking the CRANK input C9 or some signal from the distributor perhaps, before firing the fuel?? I am seeing about 10 volts on C9 during cranking. Is that enough or does it even matter to my problem?

    Thanks
    Last edited by edfiero1; 05-23-2015 at 05:36 AM.

  2. #2
    Fuel Injected!
    Join Date
    Jul 2012
    Location
    Fresno, CA
    Posts
    422
    Even without the crank input, the ECM should run the fuel pump as long as you're getting a distributor reference pulse. Make sure your wiring to the distributor is correct, grounds are in place and that you have proper voltage to the harness and coil.
    1973 K-5 Blazer, TBI 350, TH400, 1 ton axles & 38" SSRs'
    1975 280Z, TBI 350, 700R4
    1953 M-38A1, TBI Buick 231
    1951 Ford Panel, 5.3 with 4L80E

  3. #3
    Fuel Injected!
    Join Date
    Oct 2014
    Posts
    43
    Thanks Fastacton. You were right on the money. I had a problem with my distributor wiring.
    I got her running now.

Similar Threads

  1. Too big of a fuel pump?
    By trippyjoey in forum GM EFI Systems
    Replies: 7
    Last Post: 07-21-2014, 11:15 PM
  2. EFI Fuel Pump Upgrade
    By gregs78cam in forum Fuel Injection Writeups Articles and How to New and Old
    Replies: 35
    Last Post: 04-24-2014, 10:22 AM
  3. Fuel pump recommendations
    By satinblack91 in forum Gear Heads
    Replies: 0
    Last Post: 01-23-2014, 05:19 AM
  4. Fuel Pump Swap
    By ony in forum GM EFI Systems
    Replies: 16
    Last Post: 06-19-2013, 09:39 PM
  5. Fuel pump troubles
    By mike327 in forum GM EFI Systems
    Replies: 22
    Last Post: 11-12-2012, 05:47 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •