Results 1 to 8 of 8

Ls1 won't start/ just replaced fuel pump

This is a discussion on Ls1 won't start/ just replaced fuel pump within the General Help forums, part of the LSx Technical Help Section category; 98 camaro z28 ls1 won't start after replacing fuel pump. I had a cheap ebay pump that I replaced with ...

  1. #1
    Junior Member Bigjames25's Avatar
    Join Date
    Sep 2013
    Location
    Pembroke Pines, FL
    Posts
    11

    Burgundy
    98 Camaro Z28

    Ls1 won't start/ just replaced fuel pump

    98 camaro z28 ls1 won't start after replacing fuel pump. I had a cheap ebay pump that I replaced with a Walbro 255lph pump along with a new fuel pressure regulator and fuel tank pressure sensor. While trying to start the car I can hear the fuel pump priming and the pressure reads at just a little over 70lbs. I know the ls1 usually runs around 60lbs of pressure so could to much pressure be flooding the engine and stop it from turning over? I don't think so but I would appreciate any input. Thank you!
    Last edited by Bigjames25; 09-29-2013 at 04:05 PM.

  2. #2
    Junior Member Bigjames25's Avatar
    Join Date
    Sep 2013
    Location
    Pembroke Pines, FL
    Posts
    11

    Burgundy
    98 Camaro Z28

    A code did come up at first. P0452 evaporative emission control system. After I cleared it, it never reappeared.

  3. #3
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,567

    Black & Blue
    '02 WS.6 / '07 Suburban

    Does it try to start, or just crank and crank?

  4. #4
    Junior Member Bigjames25's Avatar
    Join Date
    Sep 2013
    Location
    Pembroke Pines, FL
    Posts
    11

    Burgundy
    98 Camaro Z28

    Quote Originally Posted by pajeff02 View Post
    Does it try to start, or just crank and crank?
    I believe it's just cranking and cranking because it's getting 70lbs of fuel pressure and the whole engine is cranking trying to turn over but it won't.
    Last edited by Bigjames25; 09-29-2013 at 08:04 PM.

  5. #5
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,567

    Black & Blue
    '02 WS.6 / '07 Suburban

    I guess you need to start by addressing the excessive pressure. I have found out on several occasions that "new parts" do not always mean "good parts". If you have a second fuel pressure gauge you can get your hands on, use that to verify the 70 psi reading before you go ripping into things. Should be able to rent or borrow one from a chain parts store if you don't have a friend with one handy. I am uncertain what effect the excessive pressure would have has the PCM will adjust injector pulse width in accordance with pressure and voltage. Probably has an upper limit to what it can handle though. Maybe pull a plug or two and see if they are getting washed down with excessive fuel.

  6. #6
    Junior Member Bigjames25's Avatar
    Join Date
    Sep 2013
    Location
    Pembroke Pines, FL
    Posts
    11

    Burgundy
    98 Camaro Z28

    Quote Originally Posted by pajeff02 View Post
    I guess you need to start by addressing the excessive pressure. I have found out on several occasions that "new parts" do not always mean "good parts". If you have a second fuel pressure gauge you can get your hands on, use that to verify the 70 psi reading before you go ripping into things. Should be able to rent or borrow one from a chain parts store if you don't have a friend with one handy. I am uncertain what effect the excessive pressure would have has the PCM will adjust injector pulse width in accordance with pressure and voltage. Probably has an upper limit to what it can handle though. Maybe pull a plug or two and see if they are getting washed down with excessive fuel.
    I held the pedal to the floor and the car started but the rpms were really high in park. I think it was around 2300-2500 rpms. And then the codes P0121 & P0123 came up. They're for the throttle/pedal position sensor.

  7. #7
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,567

    Black & Blue
    '02 WS.6 / '07 Suburban

    You certainly have something weird going on. Were you able to verify the 70 psi reading? Any other work done when the pump was replaced -- ie. hotwire kit for the pump?

  8. #8
    Member jb3golf's Avatar
    Join Date
    Jan 2007
    Location
    Zona
    Posts
    600

    Red
    1998 Camaro Z28 Conv. M6

    70 doesn't sound right at all.....sounds like something else wasnt plugged in correctly or a voltage/wiring issue within the pump assembly...so did you figure this out?

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Replaced fuel pump and now gage is inop
    By TRANSWORLD43 in forum General Help
    Replies: 14
    Last Post: 02-24-2015, 06:40 PM
  2. replaced fuel pump today
    By redbird98 in forum Camaro / SS
    Replies: 6
    Last Post: 10-28-2010, 10:56 PM
  3. Help: Replaced Fuel Pump, Gas POURING out of cap! Help**
    By SteelCityTA in forum General Help
    Replies: 4
    Last Post: 04-24-2009, 12:27 PM
  4. New fuel pump, drove it, then wouldn't start
    By GottaHaveLS1 in forum General Help
    Replies: 10
    Last Post: 07-02-2008, 08:43 PM
  5. got fuel pump replaced, now gas mileage is crap
    By chris5 in forum General Help
    Replies: 4
    Last Post: 06-25-2007, 09:40 AM

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
  •