- 7,010
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- Papalote, TX
They are more or less in front of the tank and a PITA to get to, do one at a time so you do not get the lines crossed.
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Injection pump won't move when turning crank.
- Thread starter Mattguy
- Start date
Action
Well-known member
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- East Tennessee
Crawl under and look forward of tank. The metal lines clamped to side of tank lead to brass check valves with rubber hose on each end. You can install a longer hose or gut the valves and put back in.
When i was working on a hmmwv, i noticed a valve had different size bung on each end. Check that before installing a single longer hose. I dont know what is stock. We were installing an aux tank.
- 753
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- 93
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- Highland, Indiana
Found them. Which one is supply?
- 7,010
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- Papalote, TX
It does not matter remove both of them, like I said just do one at a time.
- 334
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- Cleveland,TN
If its sucking air at the fuel filter you have a clogged filter (maybe) or the tank sock is plugged (probably). You did have a look in the tank, right???
- 753
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- Highland, Indiana
No, didn't look in tank, becausewhen I drained the 2 gallons of fuel that was in the tank it was clean fuel. I burned it in my torpedo heater. I was thinking maybe the sock is clogged. If check valves are clean that will be my next step. It's starving for fuel.
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- 753
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- Highland, Indiana
I put a new filter in but maybe it got clogged from all the crap diesel that was still in the line. I'll pull fuel filter. It's new. And I sonic cleaned the strainer.
Action
Well-known member
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There is a check valve on the fuel filter can, too. On the input. Accessed through doghouse.
- 753
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- Highland, Indiana
I pulled line off fuel filter and dry. So I just pulled hose off fuel pump and am going to see if I can pull fuel to there with a separate piece of hose with barbed connector. If I can't pull fuel then it would be check valve or sock I believe.
springer1981
Well-known member
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- Maine
General rule of thumb for fuel lines. The larger one is the supply and the smaller one is the return.
You could also pull the hose off the check valve after the check valve and see if you have fuel flow.
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springer1981
Well-known member
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- Maine
Have you checked to see if you are getting fuel to the pump and then check to see if it is pumping?
- 753
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- Highland, Indiana
I just tried sucking on the fuel supply side of the fuel pump with extra piece of hose and can't pull anything. So it must be the check valves or the sock in the tank. Do I have to drop the tank to get to the sock or can I get to it from the access cover?
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Drop. Clean up the inside and replace the gasket so you can fill it without leaking out of the top. I need to do the same thing now. I replaced the sending unit and I could see it was clean inside through the hole but you can’t really do anything but remove the sending unit thru that access hole
- 753
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- Highland, Indiana
Completely clogged. Can't blow through either sides.
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Action
Well-known member
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- East Tennessee
I can barely blow thru new valves, if at all.
springer1981
Well-known member
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- Location
- Maine
A check valve is often a spring loaded ball and seat. Use a compressed air hose to check it. Your lungs might not be able to overcome the spring pressure.
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- 753
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Took apart and cleaned. Pulled c clip and carb cleaned all parts. Used compressed air and it blows air through. But not blowing through with my breath. Should I eliminate or just put back?
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- Highland, Indiana
Thank you everyone. She's running great. Idle a little high, adjusting throttle now.
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- 1,338
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- Las Vegas Nevada
So it was the supply check valve?
- 753
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- Highland, Indiana
Yes it was supply check value. Cleaned it out and reinstalled. Runs great! Now no power steering. Doesn't end.