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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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  Topic Review (Newest First)
10-26-2015 08:01 PM
94turbodincamo Ok changed all the return lines got the filter changed and battery connections changes and it runs pretty good was only able to do about 45 and drove maybe 3 miles but it didn't DIE!!! Think we fixed the fuel problem now I have to tackle the valve cover gaskets and the line on top of the turbo
10-26-2015 03:24 PM
chuckster57 Fuel pressure gauge at the schrader valve. Should be 4-6 PSI.

Then test for volume: remove valve core, route a hose to a suitable container. Disconnect the Fuel Shut off solenoid. It's on the top of the IP on the Drivers side FRONT connector. Crank for 10 seconds, should get 1/3 pint minimum.
10-26-2015 12:36 PM
94turbodincamo Yep that's the pic lol. How do I check my fuel pressure. I believe that's my big issue... Bought lines to replace the ones we talked about. Also replacing fuel filter today.
10-26-2015 12:22 AM
chuckster57 Sounds like some sort of fuel issue. That pic is from my photobucket account. It's in my powdercoating album. I did the air cleaner box, here's the original photo:

Was the line leaking? If so you probably should replace the whole return system. It is getting late, family guy is on so we'll continue this tomorrow.
10-26-2015 12:14 AM
94turbodincamo Googled 94 f250 7.3 and it was one of the first ones. it's late didn't wanna walk out in the rain to get picture. Anyways could fuel pressure be the problem?
10-26-2015 12:12 AM
chuckster57 That is a fuel return line. BTW, where did you find that pic? Looks like it may be mine.
10-26-2015 12:06 AM
94turbodincamo Ok not sure if this photo will upload. This is not my engine but the line right under the intake that has the red hose clamps and runs from the metal line over to the throttle body is the line I replaced I measured the old line and replaced it with the exact same length of new line
10-26-2015 12:00 AM
chuckster57 The piece with the throttle cable is the Injector Pump. Sounds like a return line and the system may have been altered. The lines are attached to plastic caps on the tops of the injectors and return unused fuel back to the tank and to the IP to cool it off.

The picture I uploaded is the routing that is used in a turbo charged engine.
10-25-2015 11:54 PM
94turbodincamo Ok the line came across from a piece that was on the motor under the intake and came across to center top of the motor... It has the throttle cable on the side of it
10-25-2015 11:47 PM
chuckster57 Is it one of these lines:

That is part of the fuel return system. You could be sucking air into the system. Is it the one from the injector to the "throttle body" ( the big thing at the front with 8 steel lines on the back of it?
10-25-2015 11:37 PM
94turbodincamo I'm sending the wife tomorrow while I'm at work to pic up a new fuel water seperator or fuel filter as the guy at autozone insist it be called lol. I also replaced the fuel line that jumps from driver side of motor to I guess is a throttle body because the old one was crap and it didn't help.
10-25-2015 11:34 PM
94turbodincamo Ok I did check the filter by unscrewing the knobby nut and got old fuel a little water and then clean fuel....... Started up went a few miles ran good even got it up to 60 then boom dead.... Pulled over hung out.... Started it up got about 4 miles at 30mph then dead again... Drove a total of 15 miles just to get it to the house and died 4 times. The battery terminal clamps are not in good condition at all either
10-25-2015 11:31 PM
chuckster57 Welcome to the Diesel Stop.
The metal tube on the top of the turbo is the oil feed for the turbo shaft. The end of the tube has a gasket (grommet) that is sealed by tightening the nut. If it can't be tightened any more the grommet needs replacing.

Next time it dies, pull over and check the fuel filter. If it's not full then you have a fuel delivery issue. Post up your results and we can proceed with possible causes/remedies.
10-25-2015 11:24 PM

Ok so I picked up a running 94 7.3 turbo with 243k miles the truck runs decent at idle. IT WILL DIE if I go over 40mph not sure where to start... Also have a leak at the top of the turbo on a small metal line not sure what this piece is called . But any ways where do I need to start?

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