2000 sierra 4.3 wont stay running
-
- Posts: 1
- Joined: Mon Jan 14, 2013 2:36 pm
2000 sierra 4.3 wont stay running
2000 sierra 4.3, turn key on have 60 psi on testor, you can hear the fuel pump run for 2 secs, then gauge drops back to 0, when running, it bounces between 48-54 psi, then dies, wont stay running, just did recent full tune up, ac delco spark plugs, new wires, cap and rotor, truck has been down since day b4 thanksgiving
Re: 2000 sierra 4.3 wont stay running
If the pressure drops down to zero, then you definitely have a problem somewhere in the fuel delivery system. You'd either be looking at a bad fuel pump, or a leaking fuel pressure regulator. The regulator is located inside the upper intake plenum, so that would need to be removed to actually be able to see if the regulator is leaking.
More than likely though, the pressure is just backflowing right back through the pump. I've seen this quite a bit, but also have seen plenty of regulators go out too. If your truck has a return line, try blocking it off and see if the pressure holds, then you'd know it is a bad fuel pressure regulator. If it still drops with the return line blocked off, then the pump is bad.
More than likely though, the pressure is just backflowing right back through the pump. I've seen this quite a bit, but also have seen plenty of regulators go out too. If your truck has a return line, try blocking it off and see if the pressure holds, then you'd know it is a bad fuel pressure regulator. If it still drops with the return line blocked off, then the pump is bad.
GM Dealer Technician For 18+ Years
In the automotive industry for 20+
In the automotive industry for 20+
-
- Similar Topics
- Replies
- Views
- Last post
-
-
New post 95' GMC G2500 5.7 won't stay running
by Beerstalker73 » Thu Sep 07, 2017 8:16 pm » in GMC Trucks - 4 Replies
- 11682 Views
-
Last post by carriedi
Thu Sep 21, 2017 11:13 pm
-
-
- 1 Replies
- 9221 Views
-
Last post by carriedi
Sat Dec 25, 2021 10:06 pm
-
- 5 Replies
- 15522 Views
-
Last post by tech3
Tue Jan 05, 2016 11:06 am
-
- 8 Replies
- 18704 Views
-
Last post by CrazyW
Sat Jun 17, 2017 12:13 pm
-
-
New post 2001 Chevy suburban won't stay running
by Trudy » Sun Jul 22, 2018 3:00 am » in Chevy Suburban - 1 Replies
- 11755 Views
-
Last post by carriedi
Tue Jul 24, 2018 8:55 am
-