Where are the Bleed screws on the injector pump?
Locate the 2 bleed screws on the injector pump. You will require a 5/16″ wrench to loosen or remove these. With your Ziploc bag and diaper in place for capturing the escaping fuel air mixture, operate the hand primer lever until you have air free fuel coming from the bleed screw/s, then close the air vent fittings.
How to bleed the fuel system and filter?
Unfortunately it is not feasible to fill the new element with fuel so the air will have to be evacuated and replaced with fuel as part of the fuel bleeding process . This will be done with the hand primer pump. PURGING THE AIR WITH THE HAND PRIMER PUMP : Don’t be stingy when venting air and/or a mixture of air and fuel. The fuel system must be
What happens when you bleed the fuel pump?
4.108/7 Owners, pay particular attention when bleeding the pump, the uppermost bleed screw which incorporates the anti-stall device. (as shown below) This fixture on some pumps is bonded into the housing and can easily break free, especially on older pumps. This will then leak profusely and render the engine un-serviceable.
Can a hand primer pump be used to Purg air?
PURGING THE AIR WITH THE HAND PRIMER PUMP : Don’t be stingy when venting air and/or a mixture of air and fuel. The fuel system must be completely free of air in order for the injector pump to function properly. Any air in the pump will prevent it from developing enough pressure to “Pop” the injectors.
Locate the 2 bleed screws on the injector pump. You will require a 5/16″ wrench to loosen or remove these. With your Ziploc bag and diaper in place for capturing the escaping fuel air mixture, operate the hand primer lever until you have air free fuel coming from the bleed screw/s, then close the air vent fittings.
How to bleed air out of the fuel system?
Open the left screw at the top (10mm wrench) a few turns and wait for fuel to run out. Once there are no more bubbles coming out tighten screw back up and repeat with the screw on the right. This will indicate that the filter is full of fuel.
PURGING THE AIR WITH THE HAND PRIMER PUMP : Don’t be stingy when venting air and/or a mixture of air and fuel. The fuel system must be completely free of air in order for the injector pump to function properly. Any air in the pump will prevent it from developing enough pressure to “Pop” the injectors.
How can I get straight fuel to my injectors?
There will be a small bleeder screw (10mm wrench) on the pump where the fuel line goes in to the pump. Loosen it and wait for all of the air bubbles to come out then tighten. You should be getting straight fuel to your injectors now.