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Vst tank empty

Old 10-25-2015, 01:18 PM
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Default Vst tank empty

I took off my VST Tank to clean the filter on the HP fuel pump. When I replaced the VST tank and hooked everything Back up, I turn the key to on and it clicks and does not buzz like it did before I took it off. The tank is completely empty and it's not pulling any fuel in. I checked relays and tapped them and that's not the issue. Does the VST have to be bled? I've pumped the primer bulb until it's hard but that's not helping. Any help is appreciated.
Old 10-25-2015, 01:18 PM
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2001 ox66 150 hp
Old 10-25-2015, 01:20 PM
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The primer bulb should fill the tank. The pump in the VST doesn't pull fuel from the fuel tank. The diaphragm lift pumps do that job.
Old 10-25-2015, 01:30 PM
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Originally Posted by Whaler27 View Post
The primer bulb should fill the tank. The pump in the VST doesn't pull fuel from the fuel tank. The diaphragm lift pumps do that job.
It won't let me pump that far. It gets hard shortly after filling the fuel filter with fuel and gets too hard. I can tell it's not even close to getting a significant of fuel Into that VST tank
Old 10-25-2015, 01:59 PM
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Maybe float hung up inside VST tank
Old 10-25-2015, 02:12 PM
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It is not a good idea to run an electric fuel pump without it being submerged in gasoline. The gasoline cools and lubricates the fuel pump.

If the VST cannot be refilled using the primer ball then something is amiss in the fuel system.
Old 10-25-2015, 02:47 PM
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Originally Posted by alloyboy View Post
It is not a good idea to run an electric fuel pump without it being submerged in gasoline. The gasoline cools and lubricates the fuel pump.

If the VST cannot be refilled using the primer ball then something is amiss in the fuel system.
Anyone know what the buzzing sound is under normal operation and why it's just making a click now and no buzzing? It was working fine before I took off and cleaned the filter
Old 10-25-2015, 02:49 PM
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Originally Posted by alloyboy View Post
It is not a good idea to run an electric fuel pump without it being submerged in gasoline. The gasoline cools and lubricates the fuel pump.

If the VST cannot be refilled using the primer ball then something is amiss in the fuel system.
X2.
Old 10-25-2015, 02:58 PM
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Originally Posted by RAMRODNEY View Post
Anyone know what the buzzing sound is under normal operation and why it's just making a click now and no buzzing? It was working fine before I took off and cleaned the filter
My guess would be that any buzzing sound coming from the VST would have been the pump running. If the pump itself is now just making a strange noise my guess would be that the pump is locked up and what you are hearing is it trying to turn.

If you are hearing something clicking but it is not coming from within the VST my guess would be that it is the main relay closing.

You turn the key on and the relay closes. It is a mechanical relay and makes a sound. The relay closing applies voltage to the pump and the computer grounds the pump for several seconds to make the pump run and build up fuel pressure.
Old 10-25-2015, 03:07 PM
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I just got it fired up. VST tank sounds normal but it only ran for 15 seconds or so. I checked the oil line that goes into the VST tank and I also checked the drain at the bottom. No sign of any oil
Old 10-25-2015, 03:14 PM
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I guess the next question is if the oil pump or lines need to be primed
Old 10-25-2015, 03:23 PM
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Not to hijack but I have wanted to check/clean vst filter but haven't yet drained the tank today as I'm winterizeing and thinking of trying to get to the filter inside any helpful tips would be appreciated 1999 ego ox66 250
Old 10-25-2015, 03:32 PM
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Does your model have that grey one way valve in the fuel line near the on engine fuel filter?
Sometimes they stick closed and block fuel to the tank. You can take it out and use a double end barb to replace it. Or you can take it apart and clean it up.
Good luck.
Old 10-25-2015, 04:25 PM
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The click thing might be a thermal overload, either in the ECU or the pump. They may be trying to save you from the dry sump problem.
Old 10-25-2015, 04:46 PM
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Fuel pump is working like it should. The VST tank is just not being fed any oil. Any suggestions? Supposedly the oil pump is gear driven so does that mean the motor has to be running for it to pump oil in? Would disengaging the kill switch and cranking it accomplish this without damaging the motor

Last edited by RAMRODNEY; 10-25-2015 at 09:22 PM.
Old 10-26-2015, 04:01 AM
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Remove checkvalve

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