fuel pump
fuel pump
Logistics Pro
Joined: Sep 2010
Posts: 4,411
Likes: 4
From: Victor, MT
Fuel pressure if I am not mistaken is like 60-120 psi from the lift pump, the pump itself increases the pressure when it delievers fuel to the injectors at 1400 psi(new injectors typically open at 1700). to check the pressure on 6.9 engines check it at the 3/16" hose barb on the fuel filter outlet elbow, and on 7.3 at the fuel filter orifice/return line fitting or restricted filter sensor port. If checking either at the filter return line fitting, plug the return hose. Fuel pressure here should be 1 psi minimum at idle. Lift pump pressure is taken at the fuel filter bleed schrader port and should be 2 psi minimum at idle. Its not much but thats what i believe it is.
Lead Driver
Joined: Mar 2006
Posts: 5,111
Likes: 1,544
From: western SD
The lift pump produces only 5-7 lbs. at the filter head. There is a schrader valve on the fuel filter head (looks like a tire valve) to check the pressure. Air leaks on the return side usually makes for a longe cranking time when trying to start after setting for a while. If you think you have an air leak, remove the fuel filter after the truck has been setting over night to check to see if it is full.
Thread
Thread Starter
Forum
Replies
Last Post
rcraig
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
4
Nov 15, 2016 07:53 AM
Crewcab Turbo
1999 - 2003 7.3L Power Stroke Diesel
22
Apr 8, 2013 07:07 AM
don77
1994.5 - 1997 7.3L Power Stroke Diesel
6
Apr 17, 2009 09:48 PM
Dogs-in-the-back
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
1
Jan 13, 2007 12:47 PM
