93 7.3idi starts but won't stay running.
Elder User
Joined: Dec 2011
Posts: 751
Likes: 0
From: Kodiak, Alaska
Replace everything made of rubber in the fuel system. I am really getting sick of hearing of how much air intrusion causes our engines to have constant starting problems, mine included. There has got to be a better way. I am just going to install an E-pump and let it prime for a few seconds before starting. Air intrusion has been a constant thorn in my side since i bought my first IDI ford truck 8 years ago. I believe it is because of something in the new ULSDiesel that we get is corrosive to the rubber in our fuel system. the plastic caps that come in the return line kits will cut the o rings on your injectors so if you dont push them on perfectly they will still leak air into the system 
Fleet Owner
Joined: Jul 2006
Posts: 20,420
Likes: 889
From: Mi'kma'ki
you ain't lying.
FACET® DURA-LIFT® Solid State High Performance Heavy Duty Diesel Electric Fuel Pump for Thermo King and Carrier Trucks.Carrier Transicold #30-01108-02SV
Installed In Engine Bay w/5a inline fuse & 30a relay off the battery w/FSS line to trigger pump w/turn of the key w/Mr.Gasket Fuel Pump Block Off Plate #5422
main specs to look for:
Voltage: 12 Volt
Minimum Shut Off Pressure: 9.0 PSI
Maximum Shut Off Pressure: 11.5 PSI
Gallon Per Hour Flow: 33
example:
http://shop.aftermark.net/shop/dura-...ift_Fuel_Pump/
FACET® DURA-LIFT® Solid State High Performance Heavy Duty Diesel Electric Fuel Pump for Thermo King and Carrier Trucks.Carrier Transicold #30-01108-02SV
Installed In Engine Bay w/5a inline fuse & 30a relay off the battery w/FSS line to trigger pump w/turn of the key w/Mr.Gasket Fuel Pump Block Off Plate #5422
main specs to look for:
Voltage: 12 Volt
Minimum Shut Off Pressure: 9.0 PSI
Maximum Shut Off Pressure: 11.5 PSI
Gallon Per Hour Flow: 33
example:
http://shop.aftermark.net/shop/dura-...ift_Fuel_Pump/
Posting Guru
Joined: Dec 2012
Posts: 1,065
Likes: 2
From: western washington
Warning, warning, To much fuel pressure to inlet of Ip May cause erratic operation of the governor and or the timing advance inside the Ip. The Idi consumes approx. 7 oz of fuel in one minuet at cruse speed, there is no need. for hi pressure hi flow pumps, and I do not recommend doing away with the return line from the filter head as it removes air bubbles from sloshing of the tank when driving. perhaps 4x that at full trohttle thats 14 gallons a hour, all most any e pump will be fine, cept them mr gasket junk.
Logistics Pro
Joined: Apr 2005
Posts: 4,221
Likes: 17
Warning, warning, To much fuel pressure to inlet of Ip May cause erratic operation of the governor and or the timing advance inside the Ip. The Idi consumes approx. 7 oz of fuel in one minuet at cruse speed, there is no need. for hi pressure hi flow pumps, and I do not recommend doing away with the return line from the filter head as it removes air bubbles from sloshing of the tank when driving. perhaps 4x that at full trohttle thats 14 gallons a hour, all most any e pump will be fine, cept them mr gasket junk.
That's this one, no bueno:Trending Topics
Thread Starter
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Mountain Pass
Joined: May 2011
Posts: 222
Likes: 11
From: Strasburg,CO
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i ain't rite
Joined: Mar 2005
Posts: 65,631
Likes: 5,639
From: Marlboro Mental Hospital.
actually, no. a standard e pump is what you do not want to use.
the facet duralift pump is what you want to use.
the facet duralift pump is what you want to use.
i ain't rite
Joined: Mar 2005
Posts: 65,631
Likes: 5,639
From: Marlboro Mental Hospital.
you can use it before the mechanical pump but if the diaphragm in the mechanical pump rips it will fill the crankcase with fuel
i prefer bypassing the lift pump and just using the E-pump
i prefer bypassing the lift pump and just using the E-pump
Postmaster
Joined: Dec 2011
Posts: 3,860
Likes: 7
I read an article explaining the problem:
There is supposed to be a check-valve in the filter head. This is what is failing(ULSD? Time?), and that means air is sucked into the filter:
Ford diesel 6.9 7.3 IDI
http://www.intellidog.com/dieselmann/filter.jpg
Note that I just added an outside checkvalve myself, and it totally solved my own air intrusion problem... Even with one of the return lines open to the air!
There is supposed to be a check-valve in the filter head. This is what is failing(ULSD? Time?), and that means air is sucked into the filter:
Ford diesel 6.9 7.3 IDI
On 7.3 engine the filter return orifice contains a check valve. This check valve is usually a rubber flap inside the fitting, and if this fails air is drawn into the filter as the fuel cools and contracts. This can be detected by removing the fitting and trying to blow through it from the hose barb end. If you are able to blow through it from this direction, it needs to be replaced. Seal the threads on the orifice with Loctite 515 Gasket Eliminator or PST. There are two different flapper valve orifices--3/16" and 1/4"--and the correct one needs to be used with the coresponding hose size or leaks may occur. Starting in 92 a 1/4" filter orifice was introduced without a flapper valve using a spring and plastic check ball. The spring-and-ball and flapper orifices are not interchangable; they have different headers. Also, the correct size return lines hose needs to be matched to the injector caps and the proper clamps used--not worm-gear, this will distort the hose; either OEM spring clamps or fuel injection system screw-and-band type.
Note that I just added an outside checkvalve myself, and it totally solved my own air intrusion problem... Even with one of the return lines open to the air!
Logistics Pro
Joined: Apr 2005
Posts: 4,221
Likes: 17
Ifrythings took one of these valves apart and posted pics here:
https://www.ford-trucks.com/forums/1...l#post13225262
Good info!
https://www.ford-trucks.com/forums/1...l#post13225262
Good info!