Slowing down a fuel pump

[ra65]

Put in a 265L/h pump the other day and it is pumping to much fuel. All going down the return and is pretty loud. Want to slow it down a bit. What kind of resister would do the job? Was thinking of a potentiometer even.

[mrshin]

A big, fat ceramic resistor, otherwise control it properly with an appropriate power transistor.

[brett_celicacoupe]

something like a jaycar motor speed controller (PWM) would be suitable provided the motor can take not running at full power.

at X load, override the FET on the jaycar board and run the pump at full speed.

[Mos]

You could always try a Toyota fuel pump resistor, or combination of a number of them to get the appropriate result.

Mos.

[ra65]

You could always try a Toyota fuel pump resistor, or combination of a number of them to get the appropriate result.

Mos.

The pump is just getting 12v direct from battery (bypassed stock wiring). Any idea if ra65 would have one as standard?

You used to not be able to hear the pump at all. This thing you can hear it rushing through the fuel rail.

[Mos]

The pump is just getting 12v direct from battery (bypassed stock wiring).

That's fine.

Any idea...

Yes.

... if ra65 would have one as standard?

No.

They are typically used on higher powered toyotas. If you're keen I could probably post you a couple.

Curious why you put the pump in if you don't need the flow?

Mos.

[ra65]

The other pump died. Felt better about putting in one of these than fucking around pulling one from something at the wrecker. Guess I could have gone stock but I'm kindof sick of getting shafted by genuine toyota parts.

Thanks for the offer but I think I will just cruise down to jaycar in the next couple of days or have a look at the wrecker when I am next there. Have to get me a coil driver and a ISCV valve so I will probably find something in my travels.

[Mos]

MX83s have them on the front of the driver's side strut tower.

[oldeskewltoy]

DON'T power down a Walbro(or similar) gear pump. You will cause accelerated wear and getting the voltage correct to supply the correct volume will be very difficult. Get the correct pump and your are finished........

[Norbie]

I'm sure I mentioned in another thread you should get a "standard" Walbro, not one of the high flow jobbies. They're good for big power applications but they're noisy bastards.

[johnnilicte]

perhaps change your fuel regulator or install a 2nd return line from your fuel rail...

[Kyosho]

Buy a stock pump if you don't need the flow.

[SeptemberSquall]

Buy a stock pump if you don't need the flow.

werd
just run the proper pump specced for the application
get me a pn and i'll price a genuine one tomorrow

[Aaron]

Mazda used for a number of years a two stage fuel pump control that was basically a relay and a big heatsinked resitor. It was on the v6 929s, GTX Turbos and Rx7 Turbos at the very least. It wouldn't take too much to adapt this to another application. Mitsubishi also did a similar thing.

As others have said you'd use the "full power" setting for high load and the lower setting for idle etc.

If you want more info PM me and I'll dig up URLs for circuit diagrams...

A.

[mr2gze]

Mazda used for a number of years a two stage fuel pump control that was basically a relay and a big heatsinked resitor. It was on the v6 929s, GTX Turbos and Rx7 Turbos at the very least. It wouldn't take too much to adapt this to another application. Mitsubishi also did a similar thing.

As others have said you'd use the "full power" setting for high load and the lower setting for idle etc.

If you want more info PM me and I'll dig up URLs for circuit diagrams...

A.

As Mos said Toyota does this.. and id say every other manufacturer would also.
e.g.


But as oldskweltoy has said, this may not be suitable for a Walbro
cheers