12 valve won't start need help

05chevy

05chevy

gear head
Joined
Jul 17, 2010
Messages
635
94 12 valve. Just did a fuel filter and pump delete. Installed a fass 150 with 1/2" dual feed line. Have fuel to injection pump. There is no return fuel coming from the pump or fuel coming out of the delivery valves? What could be my issue? Truck ran before I installed the fass. Any help in appreciated.

Sent from my SCH-I545 using Tapatalk
 
Fuel shut off solenoid is working properly also

Sent from my SCH-I545 using Tapatalk
 
What does this system use as a restriction for the fass to work against?

I would pull the return at the pump and make sure it has purged all of the air it can by bumping the fass over for a starting point.

Monkey Fist Rage
 
I tried pinching off the injection pump return and that had no affect. I'm not getting any fuel out of the injection pump return. You would think after 20 min of cranking on and off that it would have primed the injection pump by then?

Sent from my SCH-I545 using Tapatalk
 
Remove you overflow valve and see if you get fuel out of the port. You may have too low of pressure vs the crack point of the valve.
 
Bponci said:
Remove you overflow valve and see if you get fuel out of the port. You may have too low of pressure vs the crack point of the valve.
Click to expand...

Shouldn't I still get some type of fuel out of the return?

Sent from my SCH-I545 using Tapatalk
 
May sound stupid, but I have done this.

Is there any way you swapped the overflow banjo bolt with the fuel supply banjo bolt
 
Crack one of the fuel lines feeding an injector to see if you are getting fuel
 
Are you even getting fuel to the inj pump... Process of elimination start at the begining of the fuel system and work your way forward.
 
newsmoke said:
May sound stupid, but I have done this.

Is there any way you swapped the overflow banjo bolt with the fuel supply banjo bolt
Click to expand...

overflow bolt has not been touched

Sent from my SCH-I545 using Tapatalk
 
CREED1 said:
Are you even getting fuel to the inj pump... Process of elimination start at the begining of the fuel system and work your way forward.
Click to expand...

I have fuel at the injection pump. Crack either of the dual feed lines and have plenty of fuel. Have no fuel out of the return line on the injection pump or out of the delivery valve.

Sent from my SCH-I545 using Tapatalk
 
I will put a gauge on the fuel supply from the lift pump tomorrow and see what kind of pressure I'm getting. Even if it is low pressure say anywhere from 10 to 25 psi I should still get some kind of return fuel or fuel out of the injection pump. Correct?

Sent from my SCH-I545 using Tapatalk
 
You are getting no fuel out of the return on the pump but fuel to the dual feed fittings on the pump? have you tried removing the overflow on the pump sounds air locked.
 
Lostnwalmart said:
You are getting no fuel out of the return on the pump but fuel to the dual feed fittings on the pump? have you tried removing the overflow on the pump sounds air locked.
Click to expand...

I have not removed the overflow yet. And the fuel shut off is working properly

Sent from my SCH-I545 using Tapatalk
 
I stated before remove overflow valve and see if fuel flows out when pump is on.
 
Bponci said:
I stated before remove overflow valve and see if fuel flows out when pump is on.
Click to expand...

That worked. Truck is now running. Thank you for the help. Pump was air locked

Sent from my SCH-I545 using Tapatalk
 
You must log in or register to reply here.
Top