Author Topic: Fuel pump 96 Chevy  (Read 165 times)

Offline john k

  • Sr. Member
  • ****
  • Posts: 298
Fuel pump 96 Chevy
« on: January 01, 2020, 12:43:28 PM »
Been driving this 96 half ton since 2012.  Fuel pump quit on way to work back in 2015.  I discovered previous owner cut an access hole in the box, so putting in a new one was no problem.  Couldnt see it due to the bedline.  Truck now has 209k and running fine.  Has made several 900 mile trips without a problem.  A year ago in November drove it into town,  ate, then no start.  Was 5 degrees and stiff windchill.  Had no fuel pressure.  so had it towed home.  Got a new pump, but wasn't til Feb. got it in, as we had snowstorm one after another.  Only scoop out the box so many times til it gets old.  New pump, no start,  seemed to have fuel pressure.   In May, got back at it,  and bought a pressure gauge.   Pump put out 15psi, not the 45 it needs to run.   Can't find reciept.  got another pump, NAPA,  put it in, ran fine.  45psi at the engine.  drove it several hundred miles.   Then  when 59 miles from home,  no start, no fuel pressure.   Went back the next day,  30 degrees warmer, and fired right up.  Got home, put in replacement pump,  got about 250 miles on it, at home,  5 degrees and no fuel pressure.  Got 13 volts at the pump plug, so told girlfriend to tap the top of the tank,  bingo,  55psi.   moved it 50 feet,  restarted just fine.   Went out next day,  cold, no start.   First pump was ORiellys, as was second.  Now3 NAPA pumps.   now  looking to see if GM still has a pump for a 96.   Getting a little ticked off.  Anybody have such a run around?

Offline goodfellow

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 1866
Re: Fuel pump 96 Chevy
« Reply #1 on: January 01, 2020, 01:36:48 PM »
Did you do a current draw check on the pump(s) when they were working? also, does it have an external fuel filter?  -- pumps usually don't fail that quickly unless they are stressed due to an overcurrent condition (mostly caused by restricted fuel lines or filters).

What does the inside of the tank look like?

Offline ron350

  • Newbie
  • *
  • Posts: 46
Re: Fuel pump 96 Chevy
« Reply #2 on: January 01, 2020, 03:55:36 PM »
According to Rock auto and Amazon.
AC Delco EP381 (GM 25163473) fuel pump is $75 from amazon or $84 rockauto.

AC Delco parts page:
https://parts-catalog.acdelco.com/catalog/catalog_search.php

 

« Last Edit: January 01, 2020, 04:00:47 PM by ron350 »

Offline stokester

  • Sr. Member
  • ****
  • Posts: 315
  • Air-cooled!
Re: Fuel pump 96 Chevy
« Reply #3 on: January 01, 2020, 04:47:08 PM »
Did you replace the pump electrical connector?

If memory serves me right, the AC/Delco replacement pumps include a new and improved connector. 
Nick
Yorktown, VA

Offline slip knot

  • Hero Member
  • *****
  • Posts: 1060
Re: Fuel pump 96 Chevy
« Reply #4 on: January 01, 2020, 05:53:14 PM »
Check your grounds.

Offline john k

  • Sr. Member
  • ****
  • Posts: 298
Re: Fuel pump 96 Chevy
« Reply #5 on: January 01, 2020, 09:32:27 PM »
Traced wiring from the fuse box to tank, no damage I could see.  Tried a new fuel pump relay, no change.  Cleaned the original wiring connector with electrical spray.  Soldered on a new ground wire at the pump connection, cleaned the frame attachment point, 2 pumps ago.   The one common factor is temperature,  when the temp  falls below 15 - 20 degrees, the pumps fail to work.  Tank is very clean inside,  the only filter is the sock on the pump,  which was renewed with each change, because once pressed on cannot remove without destroying it.  Have  not tried to check the draw of the motor
.  Beginning to question the specs, quality of the pumps. 

Offline gtermini

  • Sr. Member
  • ****
  • Posts: 341
    • Pictures of the junk collection
Re: Fuel pump 96 Chevy
« Reply #6 on: January 02, 2020, 09:58:32 AM »
the only filter is the sock on the pump,  which was renewed with each change, because once pressed on cannot remove without destroying it. 

Does that not have the round metal inline filter along the frame rail under the drivers door?

I sometimes think all the non-oem parts are made by one outfit and packaged to suit, and sometimes that outfit turns out junk. So then you end up with junk no matter where you buy it.

Offline slip knot

  • Hero Member
  • *****
  • Posts: 1060
Re: Fuel pump 96 Chevy
« Reply #7 on: January 02, 2020, 10:04:34 AM »
My 98 had a filter on frame under the drivers door. Do the pumps work again after they warm up? We see a lot of ethanol moisture issues in my area. Is it possible the fuel get slushy and won’t pump at that temperature? 

Maybe time for a dealer item pump?

Offline john k

  • Sr. Member
  • ****
  • Posts: 298
Re: Fuel pump 96 Chevy
« Reply #8 on: January 04, 2020, 03:36:13 PM »
Found that there is a filter inline in the framerail,  hidden above the crossmember.    today ordered a pump, strainer, and filter from Rock Auto.  Sometimes it would start when it got above 30, most times it still took a tap on the tank. 

Offline gtermini

  • Sr. Member
  • ****
  • Posts: 341
    • Pictures of the junk collection
Re: Fuel pump 96 Chevy
« Reply #9 on: January 04, 2020, 05:54:10 PM »
The threaded fittings on those filters are always tighter than the dickens for some reason. Flare nut wrench/crowsfoot is a must.

Hopefully that filter is just gunked up and get's her going again.