Results 1 to 6 of 6

fuel pump issues

This is a discussion on fuel pump issues within the General Help forums, part of the LSx Technical Help Section category; OK so I changed the fuel pump on my 98 formula about 3 months ago. It happened that I really ...

  1. #1
    Junior Member SuperStock's Avatar
    Join Date
    Apr 2008
    Location
    Utah
    Posts
    16

    Red
    1998 Formula

    fuel pump issues

    OK so I changed the fuel pump on my 98 formula about 3 months ago. It happened that I really didn't need it because the regulator was the issue. No big deal new pump (Walbro 255 lph knock off from HighFlow Fuel systems) is probably a good thing. So I left the filter on for probably to long but finally changed it last friday. I head into Salt Lake City (about 30 miles from where I live) and about 5 miles from my destination I get a power loss and SES light comes on. I keep driving to where I was going shut the car off and try to restart it... nothing. I shut everything off nd listen for the pump to kick on and nothing. I leave it there and tow it home the next day. It sat in my drive way from sat to today (wed) and I go to cut the access panel so I don't have to drop the tank again and out of pure curiosity I turn the key on and theres the pump. So I clear the codes, go for a ride around the block and pump stops again. I cut the access panel pulled the pump out and checked voltage. I get 12 volts for about 2 seconds then dead. I plug it back in and no pump. Is it the pump or something else. Thank You!

    P.S. Also may have maybe 700 miles on it since the new pump went in.

  2. #2
    Senior Member bigrondownhiller's Avatar
    Join Date
    Feb 2006
    Location
    Orange County, NY
    Age
    42
    Posts
    2,674

    Black
    1996 Camaro Z28 vert

    Could be the relay. Switch it with another one and see if there is till a problem.

  3. #3
    Veteran 0rion's Avatar
    Join Date
    Aug 2005
    Location
    ohio
    Posts
    22,519

    98 Formula
    06 duramax

    I agree. Try swapping out that relay and see what happens. Should be able to just switch it with another relay next to it to test it.

  4. #4
    Junior Member SuperStock's Avatar
    Join Date
    Apr 2008
    Location
    Utah
    Posts
    16

    Red
    1998 Formula

    that was the first thing I tried next to checkin the fuse... the pump has a 1 year warranty so I am sending it back. Hope thats the problem

  5. #5
    Member shadowsnkx's Avatar
    Join Date
    Jun 2008
    Location
    Laurel, MS
    Posts
    112

    Blue
    1998 firebird formula

    how hard is the pump to replace. I have a humming in the rear of my car, loss of power and ses flashes. p0307 cyl 7 misfire code. I thought that it must be the pump because of the humming.

  6. #6
    Veteran 0rion's Avatar
    Join Date
    Aug 2005
    Location
    ohio
    Posts
    22,519

    98 Formula
    06 duramax

    if it were your pump you'd most likely be getting p0300 misfires which would be random on all cyl. The first step is to check your pressure at the rail and see what you have there....should be ~58psi and hold steady. The humming in the pump is probably the bearings in the pump. Mine hummed for a couple of years and when I swapped fuel pumps it was still going. There's a thread somewhere where people have had good luck with a fuel additive for hushing those bearings up some. I'll try to find the thread and post a link for you. Have you pulled that #7 plug and looked at it and the wire?
    At the end of the day it could be your fuel pump but I would diagnose it as such instead of just throwing a pump in there. It's time consuming and pricey to swap a pump. If you do the pump yourself you can get them from harris speed works for a couple hundred bucks. If you pay a shop to do it expect to pay around $1k for an OEM replacement.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Fuel Pump issues again.
    By SMWS6TA in forum General Help
    Replies: 11
    Last Post: 04-30-2016, 03:29 AM
  2. Fuel pump fuel guage issues on my '02 B4C
    By ANDYZ28 in forum Camaro / SS
    Replies: 7
    Last Post: 12-29-2014, 11:30 AM
  3. fuel pump issues
    By DemonSpeed in forum General Help
    Replies: 16
    Last Post: 08-10-2009, 02:06 PM
  4. LS1 all yr fuel injectors, oe fuel rail, pump,more
    By Frost in forum Parts For Sale / Trade
    Replies: 7
    Last Post: 04-27-2009, 03:26 PM
  5. Replies: 3
    Last Post: 10-02-2006, 07:23 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
  •