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Hello I need help identify what this specific part is called I understand it's supposed to allow fuel to circulate back to the feed line from the return line but is it supposed to have a check valve in it. My truck is a 1987 ford f250 6.9. your help is greatly appreciated
That is the elbow that goes on your OE fuel filter assembly above the passenger's side valve cover. There's a solid fuel line that connects it to your IP. The solid line has olives on both sides to seal it.
The barb on the side is for a hose that goes to your #1 injector return line cap. released a TSB to eliminate this fuel hose since it's a potential source of air intrusion. Later 7.3l trucks had an elbow without the hose barb and used a return line cap with 1 port on the #1 injector (to connect it to the #3 injector return line cap).
You can eliminate the #1 injector return line hose by putting a cap and hose clamp on the elbow barb and #1 injector return line cap port.
That is the elbow that goes on your OE fuel filter assembly above the passenger's side valve cover. There's a solid fuel line that connects it to your IP. The solid line has olives on both sides to seal it.
The barb on the side is for a hose that goes to your #1 injector return line cap. released a TSB to eliminate this fuel hose since it's a potential source of air intrusion. Later 7.3l trucks had an elbow without the hose barb and used a return line cap with 1 port on the #1 injector (to connect it to the #3 injector return line cap).
You can eliminate the #1 injector return line hose by putting a cap and hose clamp on the elbow barb and #1 injector return line cap port.
That is the elbow that goes on your OE fuel filter assembly above the passenger's side valve cover. There's a solid fuel line that connects it to your IP. The solid line has olives on both sides to seal it.
The barb on the side is for a hose that goes to your #1 injector return line cap. released a TSB to eliminate this fuel hose since it's a potential source of air intrusion. Later 7.3l trucks had an elbow without the hose barb and used a return line cap with 1 port on the #1 injector (to connect it to the #3 injector return line cap).
You can eliminate the #1 injector return line hose by putting a cap and hose clamp on the elbow barb and #1 injector return line cap port.
The factory 7.3 setup was the #1 injector had a return line that connected to a barbed fitting on the fuel filter head. The only trucks that got the return line cap with one barb/port were the factory turbo trucks on #7.
#1 & #2 were never directly connected as a factory setup, but both my trucks are setup that way now.
To the OP you might consider swapping that hard line for a soft line and eliminate the olives as a potential source of problems.
The factory 7.3 setup was the #1 injector had a return line that connected to a barbed fitting on the fuel filter head. The only trucks that got the return line cap with one barb/port were the factory turbo trucks on #7.
#1 & #2 were never directly connected as a factory setup, but both my trucks are setup that way now.
To the OP you might consider swapping that hard line for a soft line and eliminate the olives as a potential source of problems.
Thanks for the clarification.
I got a fuel elbow without the barb from a 7.3l truck in the salvage yard. I suppose it was a factory turbo truck. I thought about taking the entire drive train for parts and the E4OD, but just took the multi-piece fuel filter housing.
My 6.9l is setup without the injector return line going to the fuel filter housing. Didn't the 7.3l trucks also have a fitting between the #1 injector & the injector line for a timing device hook-up? I'm not sure if this is for the luminosity probe, but the #1 injector line from my spare 7.3l IDIT is actually shorter than the one on my 6.9l because of this adapter.
Didn't the 7.3l trucks also have a fitting between the #1 injector & the injector line for a timing device hook-up? I'm not sure if this is for the luminosity probe, but the #1 injector line from my spare 7.3l IDIT is actually shorter than the one on my 6.9l because of this adapter.
Yes there is a fitting on the #1 injector line on 7.3l truck engines for the clamp on piezo sensor. Vans with 7.3l had the fitting on a different line, maybe #4? due to access differences in a van. Each engine had a shorter injection line to correspond to the fitting. The 6.9 engines didn't include the fittings, I presume that to mean they were factory timed with the luminosity probes.
Luminosity probes get screwed into the glow plug hole, and use a light sensor to "see" the ignition flash in the cylinder.
Last edited by tecgod13; Nov 24, 2025 at 04:26 PM.
Yes there is a fitting on the #1 injector line on 7.3l truck engines for the clamp on piezo sensor. Vans with 7.3l had the fitting on a different line, maybe #4? due to access differences in a van. Each engine had a shorter injection line to correspond to the fitting. The 6.9 engines didn't include the fittings, I presume that to mean they were factory timed with the luminosity probes.
Luminosity probes get screwed into the glow plug hole, and use a light sensor to "see" the ignition flash in the cylinder.
I have read and others have confirmed that you can time the IP with the piezo clamp on #1 or #4 using the standard 20 degree offset with timing set at 2k RPM, and standard 7-10 degrees BTDC. I haven't experimented with this yet so grain o' salt and all that.
released a TSB to eliminate this fuel hose since it's a potential source of air intrusion. Later 7.3l trucks had an elbow without the hose barb and used a return line cap with 1 port on the #1 injector (to connect it to the #3 injector return line cap).
