I bet he is a tooth off on the crank

[Irving]

And?

[tmleadr03]

And?

He sent a pic of the interior with an empty bag of chips under the go fast pedal... Clearly motivated to sell. It has temp tags and a paper plate from Five Star Auto Sales. 289k on the clock. I need to see it. Looks pretty clean exterior and the tires (what I can tell) look decent.

[MED]

I am more familiar with the Cummins, but does the fuel system need to be bled out? That would be my first guess; it doesn't sound like he knew this after doing the head gaskets assuming he got it together right. I think you can crack the injector lines on a 7.3 and get the air out by cranking it. If you open up the fuel system on the older 12v and 24v Cummins, it is a lot of work to bled it out at Injectors 1,3, and 4 before it fires up; I bet it is the same for a 7.3 Ford. I would look up the fuel system bleeding procedures and see what people say about it.

[Blowby]

Not the same. Fuel in the fuel filter bowl is all you need.

[MED]

Not the same. Fuel in the fuel filter bowl is all you need.

Just out of curiosity, doesn't the 7.3 have a mechanical fuel Injection pump?. ...if so, how does it prime with air in the lines?

[mcantar18c]

Damn I wish this had popped up a few weeks ago when I was in CO. I have a hard on for OBS PSDs. I've paid that much for a running one, but if the truck's in good condition I'd say it's definitely worth negotiating with him.

If someone here buys it and keeps it in decent condition, I'll buy it from you when I get back from Trashcanistan.

[Blowby]

The 7.3 uses oil pressure from the high pressure pump to activate the intensifier piston in the injector. A stock injector will have a 7:1 ratio so with 3000 psi of oil you have 21,000 psi of fuel coming out the tips. All of this happens inside the injector body. Fuel pressure between 40-70 psi is all that is needed to feed the injector. Hope that helps.

[MED]

The 7.3 uses oil pressure from the high pressure pump to activate the intensifier piston in the injector. A stock injector will have a 7:1 ratio so with 3000 psi of oil you have 21,000 psi of fuel coming out the tips. All of this happens inside the injector body. Fuel pressure between 40-70 psi is all that is needed to feed the injector. Hope that helps.

Ok, I just read up on on the High Pressure Oil fuel injection system...interesting...

[rondog]

I thought you meant the seller himself. I've met more than a few people whose gears were a tooth off.

[Blowby]

Great concept by International but it was designed for low RPM torque. Not a problem unless you want to build a high HP motor with it.