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Yes, get rid of them. When they sit for years they get stuck and problematic.I would suggest removing the check valves at the right rear of the truck near the fuel tank. I would do that before any other troubleshooting. It worked for me and I hope it works for you.
I agree with Coug.Should also verify that the fuel lift pump is working.
When did they start installing the valves?It's worth remembering that not all of us are driving the newer trucks and the older models didn't include check valves. For a new member this could be a point of confusion. The other thing is that pressurizing the fuel system above a certain point is potentially harmful. Overpressurizing old fuel lines and diaphragms isn't a good idea and new owners would probably tend to exceed that ~5psi limit pretty easily. This is one of the reasons I built the simple vacuum bleed system I did. It draws the fuel up from the tank rather than trying to blow it up. Hooked to the water seperator it only takes about 15 seconds to draw fuel. If it doesn't then there's either a clogged line or the pickup screen is blocked or missing.
View attachment 887172
They are not on the back of the truck, they are in front of, almost on top of the fuel tank, removing these are one of the first things just about everyone does because they are so problematic.It's 99 m1123. Will check for check valves and rubber on the lines on the back of the truck. Is there any harm in deleting the checks or just clean out or replace. All the lines fuel lines around the motor have been replaced within the last few months.
Lastly I like that vacuum pump setup. Do you have a link to the pump
You need to get a foot of 3/8" ID and 1/4" ID fuel line and clamps. Remove the check valves and replace with the rubber fuel lines....It's 99 m1123. Will check for check valves and rubber on the lines on the back of the truck. Is there any harm in deleting the checks or just clean out or replace. All the lines fuel lines around the motor have been replaced within the last few months.
Lastly I like that vacuum pump setup. Do you have a link to the pump
Only a slight chance of explosion, many shop vacs have brush type motorsThis might work too. It’s just a Gatorade bottle with a hole drilled in it and sealed with tape, then hook up the old shop vac. This is how I primed my fuel system.
Sucked from the filter outlet just upstream of the injection pump.View attachment 887252
Diesel vapors are nowhere near as volatile as gasoline vapors are, so the risk of explosion is almost non-existent for just having the little sparks created by a brush type motor and the few vapors being released from unheated diesel fuel.Only a slight chance of explosion, many shop vacs have brush type motors
Another approach with a (clean) shopvac is to use the output side of the vac to push a little extra air into the tank filler neck vs. trying to suck fuel from the lines. I've done it. Worked great for me. No gatorade bottle required.Diesel vapors are nowhere near as volatile as gasoline vapors are, so the risk of explosion is almost non-existent for just having the little sparks created by a brush type motor and the few vapors being released from unheated diesel fuel.
I would definitely NOT recommend this method for a gasoline fuel system.