Fuel Clear Return: How fast to purge

[scjarena]

Still new to the 7.3 IDI. I'm still trying to get the air purged out of the fuel system after I replaced a head on my 90 7.3. I have a clear tube for the return hose to the filter and it doesn't fill completely with fuel, there is still a lot of air in it. how fast should the line typically take to completely purge? Thanks

BTW, it did replace all the injector return fitting o-rings and inspected all other return hoses.

 

[teach]

Do you have an electric pump or still the mechanical?

 

[scjarena]

mechanical

 

[teach]

I know when I had my IP pump replaced they guy who did if for me said he cranked on it for like 2hrs. That may have been a little bit of a exaggerations but I know it takes a while.

 

[scjarena]

yeah, I've gone thru this with this engine one other time and it takes a lot of cranking to get the system purged. It is the hardest type of diesel I've ever messed with the get the fuel system primed.

 

[BDCarrillo]

Still new to the 7.3 IDI. I'm still trying to get the air purged out of the fuel system after I replaced a head on my 90 7.3. I have a clear tube for the return hose to the filter and it doesn't fill completely with fuel, there is still a lot of air in it. how fast should the line typically take to completely purge? Thanks

BTW, it did replace all the injector return fitting o-rings and inspected all other return hoses.

If you replaced a head then the injectors lines to that side very likely lost their prime. Loosen the injector line nut slightly and crank until fuel comes out. If it's being a real butthead, taking out the glowplugs will bleed compression and allow faster cranking.

 

[scjarena]

Good idea taking out the glowplugs. If it doesn't start in the next few attempts I think I'll try that.

 

[OLDBULL8]

Ya better disconnect the hot wire on the FSS on the IP, or you'll have fuel squirting out the GP holes when cranking.

 

[opusd2]

If you're gonna do a lot of cranking, I hope you have a large enough gauge wire going to the starter. I like overkill on my wiring, because if the wire is just a smidge small you'll be pulling quite a few amps and that's gonna work the starter no matter how easily the engine turns over