12.7 questions

Lol, go ahead and pressurize tanks like I told you. Be sure to crimp off othe tank vent. Don’t need much pressure. I’d try at 5 lbs. I ended up putting 20 lbs and had too much. I’ve since learned better. This is a common problem, experienced by many. I have since learned. When I did it, I just took a chance on an idea I had, and it worked.Theres a bunch of ways to do it. My way is cheap and simple. You’ll also hear fuel caps pop, closing off cap vents. Like I said once it’s running, let air bleed back out vents, I cracked lines at primary to speed air bubbles out, but don’t try to remove caps, to de pressurize, a little pressure goes a long way. I poppod mine off at around 5 lbs. cap flew up into bunk like a rocket, almost got my hand.

 

If the wreck looks exaclly like yours then that will work. All series 60s have a check valve in the return that keeps fuel in the head after you shut engine off. I find it hard to believe you dont have one. If it didnt have one all the fuel in the head would drain to your fuel tanks and would never start. It has to have one.

 

It maintains pressure in head due to restricted return fitting, once system is fully primed. Think volume of fuel pumped into head, restricted at return, that’s where pressure for injectors comes from. System loop has to be fully charged with fuel. Once that happens it will draw ( siphon) fuel from top of tanks on its own.

 

The fuel pump has one also, a bad pump can also cause it to drain back and lose prime. Though it will run once primed, but not after its shut off, need to prime again. Not his issue, but something I’ve learned.

 

It works like a charm, I’ve got better things to do than make up BS.I now keep the pump with Me, in case I ever lose prime again, for whatever reason.It makes enough sense that I thought of it. Lol

 

Honestly I dont know why people have so much problems priming the fuel system.
Ive changed out injectors on my series 60 a couple times. Head compleatly empty of fuel. All it took was full fuel filter's and about 45seconds of cranking to fire it off.
The pump should push all the air out and replace with fuel by it self. Providing fuel is at the pump of course.
Never had a problem.

 

Wow you were lucky, The first time I did an injector, and didn’t drain fuel,I watched it fill the cylinder, Lol . Made up a manual suction pump, with a small hose, to remove fuel. Second injector, didn’t want to make same mistake. Drained head, and changed injector. Would not start, no matter how long it cranked. Almost burned up starter, 5 hrs with jumpers and either. Detroit says just keep cranking. Anyway , I got it primed like I said. On other hand when I changed fuel pump, no problem at all. Mechanic told me later, He never drains head, let’s it go into cylinder, showed Me his homemade contraption, a piece of pvc, with a hose and a hole in the side. Blows air through tube and creates a suction. That blew my mind. I need to get a picture of it, when I see him. So I can make one.

 

Nope. I blew out the head with compressed air before pulling injectors. No mess and no need to vacume out the piston bowl of fuel. I just made sure my davco was full to the brim with fuel and cranked. Fired up in less then 1 min of cranking. I guess I was lucky.

 

This pic shows where they are. You prob have one just further down the line.

Also top one is return.
Bottom fitting is feed