Fuel pump

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Doug G
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Fuel pump

Post by Doug G » Fri Aug 20, 2010 19:10

Is there an electric fuel pump available that will work adequately with a SU Carb and not overpower it.

Sorry about causing another 'cold sweat' Nigel. :lol:

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Dean
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Re: Fuel pump

Post by Dean » Sat Aug 21, 2010 5:43

Facet make several different models for the Mini. Mini Spares sell this one for standard setups.
http://www.minispares.com/Product.aspx? ... 938&title=
I seem to remember you having trouble with an electric pump Doug? Can you refresh my memory what the issue was?
Dean

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Doug G
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Re: Fuel pump

Post by Doug G » Mon Aug 23, 2010 1:22

The 'mechanics' (I am being tactful here) said the mech pump was not working.
I bought a new mech pump and it was installed.
The 'mechanics' said the new mech pump was not working.
They said it needed an electric pump.
This idiot owner said 'OK'.
An electric pump was purchased an installed.

Moke ran OK ish.

Fuel consumption seemed a bit on the high side.

Idiot owner has another look under hood.

When the engine is on the electric pump overpowers the SYU carb float valve and fuel pours out of the 'vent' at the top of the float chamber.

Idiot owner is worried that - apart from fuel being wasted and polluting - fuel could drip (read stream/run) on to the hot exhaust and the whole shebang could go up in smoke, idiot driver included.

Hence ignoring the 'mechanics' and changing back to the mech pump or getting a less powerful electric pump. :D :?
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Doug G
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Re: Fuel pump

Post by Doug G » Mon Aug 23, 2010 1:28

Dean wrote:Facet make several different models for the Mini. Mini Spares sell this one for standard setups.
http://www.minispares.com/Product.aspx? ... 938&title=Dean
Description ideal replacement for the original mechanical pump this road tune pump delivers 12 gallons of fuel per hour at 2.5-3.00 psi,with 1/8" NPTF thread sizes see unions FPA903. This pump is suitable for single SU carb but see SS502 for further state of tune.

Erm, is my maths correct?

12 gallons per hour at say 60mph = 12 gallons for 60 miles = 1 gallon every five miles. :shock:

What bit information am I missing here?
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Dean
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Re: Fuel pump

Post by Dean » Mon Aug 23, 2010 1:43

Just a guess here Doug, but I think those figures are the maximum it can pump (i.e. if you left the pipe unattached to the carby and turned the pump on, it would pump out 12 gallons an hour all over your driveway.
Dean

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Robin Jones
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Re: Fuel pump

Post by Robin Jones » Mon Aug 23, 2010 11:03

Yes but Dean, it would only pump for a bit more than a half hour unless you refueled. :roll:
What's a Moke tank hold 6.6 gallons? :D
Doug, I think you're confusing pressure and volume. The maximum pressure figure is to make sure you don't overwhelm the float needle. The maximum volume figure just makes sure the float bowl will never starve for fuel.
This is Matt Jones Son of Robin.

Nigel(no top)Sykes
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Re: Fuel pump

Post by Nigel(no top)Sykes » Mon Aug 23, 2010 17:34

I think the problem may well be the carb float chamber. I've run a pump in the link that Dean showed on my Moke for the last 5 years with no problems.
Every time I've had problems of the type that you're having Doug it's been the float chamber that's at fault..
Dirt in the seating................. Clean it out
Float not coming up far enough.. Brass swing arm bent, bend it back
Knackered needle ..................Like it says
Float with a pinhole in it ......... Fills with fuel + doesn't float

All of which will cause the overflow of fuel you describe
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Tim
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Re: Fuel pump

Post by Tim » Mon Aug 23, 2010 20:57

I've had problems in the past with this too, especially on long runs. The more recent carbs have a nylon float that can't be adjusted. In that case you can either lengthen the needle, or put a small washer under the seat to push it down. The best needles are the ones with a viton (black rubber) tip at the sealing end and a ball bearing at the end that the float pushes on. The viton is more resistant to dirt in the seal, and the ball helps to stop it from catching on the float (which is usually only a problem if you run out of fuel and the float sags right down).

Tim

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Re: Fuel pump

Post by Nigel(no top)Sykes » Tue Aug 24, 2010 18:10

Just out of interest, Rover (or whatever they were called that day) cottoned on to the problem. On later Minis there is a pipe connected to the overflow that runs down round the clutch housing and deposits any errant petrol out of harms way .
At least it stops the car catching fire !!!
California dreaming

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Tim
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Re: Fuel pump

Post by Tim » Thu Aug 26, 2010 11:06

I think thats part of the emission control stuff that was being phased in. On Aussie Mokes that line feeds either into the carbon absorption canister, or through a return line back to the tank, I'm not certain which, just about all of them were thrown away years ago.

Tim

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Doug G
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Re: Fuel pump

Post by Doug G » Tue Jun 26, 2012 16:51

Nigel(no top)Sykes wrote:Just out of interest, Rover (or whatever they were called that day) cottoned on to the problem. On later Minis there is a pipe connected to the overflow that runs down round the clutch housing and deposits any errant petrol out of harms way .
At least it stops the car catching fire !!!
Depositing it where?

On the road????
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Nigel(no top)Sykes
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Re: Fuel pump

Post by Nigel(no top)Sykes » Tue Jun 26, 2012 19:14

But of course!!!!.....The thinking probably went along the lines of "At least it's away from the manifold"
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Doug G
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Re: Fuel pump

Post by Doug G » Wed Jun 27, 2012 1:30

but all the cigarette butts flicked away :shock: :shock: :shock: :shock:
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Tim
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Re: Fuel pump

Post by Tim » Wed Jun 27, 2012 1:39

Any sarcastic, ignorant, libellous, unfounded or stupid opinions expressed in or through this message are the opinions of the author and do not reflect the opinions or views of any member of The Mini Moke Club or the opinions or views of any other individual.

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Doug G
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Re: Fuel pump

Post by Doug G » Wed Jun 27, 2012 1:46

So the overpowering of the float chamber and spilling fuel is not a major safety issue (apart from fuel cost and environmental issues)?
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