Did my Fuel Pump die, sitting in the driveway?

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Originally Posted by schuy1

I agree with Mario about low fuel. Running it constantly below 1/4 will kill! I know of a few that never fill the tank and seem to replace pumps often. I have no idea if my low fuel idiot light works because its never down there. Not far tween servos now, even outback,'cept the canning and simpson :D

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A another load of B/S .
Running your tank below 1/4 of a tank has nothing to do with killing fuel pumps

Just saying my friend, just saying.........:)

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Originally Posted by rangieman

Come on mate use some logic here your fuel pump is always taking fuel from the bottom of the tank :p.
Why would it be different when low on fuel the rubbish is always going to be at the bottom of the tank where it sucks the fuel up any time:cool:

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Pure physics Chris.
A wave rolling over a deep water will not stir the bottom much, a wave rolling over shallow water on a beach stirs up the sand and sediment.
This can easily be seen if you look into a wave as it nears the shore on a beach

Similarly, a full tank of fuel has less movement of liquid Fuel gushing from side to side whilst a vehicle is in motion. ( yes they have baffles to minimize this) , where a near empty tank allows more violent swishing of fuel that can dislodge debris sitting on the bottom of the tank and re-suspend it in the fuel.

Otherwise people wouldn't clean fuel tanks to remove rust and crud, if it wasn't a problem, they would just leave it in there

Cheers, Mario

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Originally Posted by rangieman

A another load of B/S .
Running your tank below 1/4 of a tank has nothing to do with killing fuel pumps

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x 2 I fully agree

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Originally Posted by Roverlord off road spares

Pure physics Chris.
A wave rolling over a deep water will not stir the bottom much, a wave rolling over shallow water on a beach stirs up the sand and sediment.
This can easily be seen if you look into a wave as it nears the shore on a beach

Similarly, a full tank of fuel has less movement of liquid Fuel gushing from side to side whilst a vehicle is in motion. ( yes they have baffles to minimize this) , where a near empty tank allows more violent swishing of fuel that can dislodge debris sitting on the bottom of the tank and re-suspend it in the fuel.

Otherwise people wouldn't clean fuel tanks to remove rust and crud, if it wasn't a problem, they would just leave it in there

Cheers, Mario

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Each to their own Mario ;)
You can try and justifie your opinion but it is what it is plus the d2 has a plastic fuel tank so no chance of rust there unless it came from the servo tank.
I still say your pump drags fuel from the bottom of the tank and if its less than 1/4 of a tank or 3/4`s of a tank its still going to be swirling around in any car moving on road and more so 4wdriving .:angel:

And there are no baffles in a d2 tank :p

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And so it goes on!

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Originally Posted by Roverlord off road spares

Running low on fuel also concentrates any rubbish contaminates in the fuel tank. Dirt seems to kit pumps in our experience.

Also When fitting new pumps it is a good idea to clean the tank out and fit a new fuel filter.
Cheers,
Mario

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I know Ford Falcons required fuel to cover the pump most of the time to assist in keeping it cool. Run the tank down, pump overheats and fails prematurely. This may be part of the issue.

It is a submersible pump. When it runs the motor creates heat. The heat needs to be removed or the motors service life will be reduced ... In many cases extremely reduced. Take the heat away from the motor (by keeping it submerged in the liquid being pumped) and the motor runs cooler and lasts much much longer.

If the pumps discharge is channelled through a jacket that surrounds the motor / pump assy, then the heat is removed. This allows this type of pump to be a "puddle sucker".

If the motor sits in free air and the pumps discharge is piped from the outlet past the motor no heat is removed.
(This configuration needs the pump motor to be submerged below the level of the liquid being pumped to provide adequate cooling - this type of pump is not a "puddle sucker" like the jacketed pump is/can be.

The D2 fuel pump is not a puddle sucker. Sure it will run with the motor exposed, repeatedly, but it will run hotter. Constantly running with a very low fuel level will more than likley reduce the service life of the pump motor as it spends the majority of its service life running hot with little or no immersion cooling.

Think what you may ... This is basic pump theory 101

:p

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Most of the EFI pumps I've met sit inside surge pots and suck in more fuel than the engine uses. The excess is returned to the surge pot so it is full to overflowing even when the fuel is down to the last 20mm. So they remain fully submersed until they run out of fuel completely.