How long has your fuel pump lasted?

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Originally Posted by stallie

Avoid running your car with 1/4 tank. The pump is fuel cooled, not enough fuel and it runs warm and wears out faster.

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Not true.

I have run mine down to next to nothing (under 5L) fuel temp stays the same the whole way.

A while ago I had a thread and argued the fuel cooler was more of a fuel heater. I don't think it was conclusive but I did agree that it's easier for fuel mapping if fuel temp is constant.

The fuel cooler that is actually a heater will heat the fuel to about 70 degrees from memory about the same time the engine reaches operating temp (about 75 - 82 degrees).

You can monitor and record the fuel temp with Nanocom

Happy Days

Joel wouldn't nanacom be measuring the fuel temp at the motor not the tank, or am I mistaken.
Dave

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Originally Posted by sdt463

Joel wouldn't nanacom be measuring the fuel temp at the motor not the tank, or am I mistaken.
Dave

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I'm not an expert on the fuel flow or pump or anything. I have read threads that have gone on for a couple of pages about the route of the fuel flow.

There is 2 parts to the pump, a high pressure and low pressure circuit. That's why there are 4 connections on the filter. In and out high pressure, in and out low pressure. I know for sure that bulk fuel flows to the motor, a little is used and then a heap returns to the tank so effectively the whole tank volume is heated.

It goes something like low pressure circuit to the filter, back to the pump, high pressure circuit to the filter and then on to the motor, then back to the tank.

Hopefully someone more knowledgeable than my will comment. I am sure the whole tank is heated though.

Happy Days

High pressure line goes direct to the FPR and does not go via the filter housing, only returned fuel goes via the filter.

Fuel temp sensor sits in the FPR so effectively measures the tank fuel temp, which is cooled (heated) by the cooler on it's way back from the head to the tank.

https://www.aulro.com/afvb/images/im...017/07/725.jpg

Yep. So like I said. Hot fuel, heated by the fuel heater/cooler goes back to the tank. It only takes about 20 minutes to heat a full tank.

Happy days.

Wrong Joel
It's warmed initially by the head, cooler has a thermostat and kicks in to keep fuel cool. Not heat it up.

The pump is cooled by immersion in the fuel, the portion not submerged runs hotter...

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Originally Posted by stallie

I replaced mine at 179K. Thought it was buggered but was just the earth wire.

Got a spare though.

Avoid running your car with 1/4 tank. The pump is fuel cooled, not enough fuel and it runs warm and wears out faster.

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Mmmm how do you do the maths on that one:eek: as a td5 runs the fuel thru a fuel cooler , So i dont think it matters as long as you have fuel in the tank it will be ok

Immersion of pump keeps the pump cool.. Think like being in a pool on a real hot day up to your waist..
Tops hot, legs are cool :D

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Originally Posted by Tombie

Immersion of pump keeps the pump cool.. Think like being in a pool on a real hot day up to your waist..
Tops hot, legs are cool :D

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Well that's feasible but I don't know how much difference it will make with the amount of fuel going through it.


Happy days.

Quote:

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Originally Posted by Tombie

Wrong Joel
It's warmed initially by the head, cooler has a thermostat and kicks in to keep fuel cool. Not heat it up.

The pump is cooled by immersion in the fuel, the portion not submerged runs hotter...

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Ok so what's the point of the thermostats being in the water not the fuel. The thermostat opens when the water is hot and let's hot water in (heated by the motor) to heat the fuel.


There has already been a thread about this. The outcome was the heat/cooler does both. It depends on your climate. It's about having a constant fuel temp. Not heating or cooling.


Happy Days