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Converting Rb25det Fuel Pump To External

turael

By turael,
in Engines & Forced Induction

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turael Enthusiast

turael

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Posted

Hey guys,

Working on a project, which calls for an external pump. I have an RB25DET standard internal pump (from a series 1 R33). Upon inspection, it seems to have tiny holes near the intake tube on the bottom of the pump. These seem to leak, which is not very awesome for an external pump.

I guess my question is, can I safely plug these holes up? Or is there something else I can do to make this an external pump?

Sadly I don't have a picture with me of the pump and its many holes. :)

thanks in advance

**RB2530** Proficient

**RB2530**

Posted
Posted
Hey guys,

Working on a project, which calls for an external pump. I have an RB25DET standard internal pump (from a series 1 R33). Upon inspection, it seems to have tiny holes near the intake tube on the bottom of the pump. These seem to leak, which is not very awesome for an external pump.

I guess my question is, can I safely plug these holes up? Or is there something else I can do to make this an external pump?

Sadly I don't have a picture with me of the pump and its many holes. :)

thanks in advance

'In tank' fuel pumps often rely on being submersed in fuel to keep them cool...ie The fuel acts as cooling medium...They can make them a lot cheaper that way...

I would also be cautious because the 'consequence' of it failing can be very high such as an in car fire...ie not like a water pump where things might get a bit wet

turael Enthusiast

turael

Posted
  • Author
Posted

Mm, while it's not going in a car, it would certainly be very unpleasant to have it leak petrol.

Overheating is a good point. I might have to submerse it in a little surge tank thing under the main tank, which would solve all my problems, but create extra work.

Such a pity that I can't get it into the main tank, and that real externals cost so much.

turael Enthusiast

turael

Posted
  • Author
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It would be far cheaper to convert this pump to external :)

but if it's not possible my next option will be to attach a small box to the bottom of the tank, to house the pump (submerged). will still be far cheaper than buying another pump.

**RB2530** Proficient

**RB2530**

Posted
Posted
It would be far cheaper to convert this pump to external :)

but if it's not possible my next option will be to attach a small box to the bottom of the tank, to house the pump (submerged). will still be far cheaper than buying another pump.

What sort of flow and pressure delivery do you need? Are you recirculating the fuel?

The temperature issue may not be an issue if the load on the pump is much smaller than what it is when it is in a car....

turael Enthusiast

turael

Posted
  • Author
Posted

ok, some background:

Providing fuel for RB25DET.

Will be level with the engine, so shouldn't need to pump up or down to get there.

Yes recirculating.

will be outside in the air/wind. I could even attach heatsinks to it and shit, seriously.

the biggest problem i see is the two little holes that leak. I don't really know what they are for, or if I can plug them up.

i see two possible solutions, inside my budget:

1. convert this pump to external, commence happy funtimes.

2. attach box to bottom of fuel tank, submerse pump in that. have lines running out of that box. this would actually stop fuel starvation without having to put baffles in the tank (which is impossible in this situation), so i'm starting to lean towards this as a better solution.

I wish someone knew what those little holes are for in the pump

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