Fuel pumps
Turbo Mini Forums

Does anyone know what capacity their fuel pumps are (i.e. Litres per minute)?

I'm convinced that my float bowl is empyting with the car flat out for a short period of time (usually in 3rd and 4th gear), causing it to splutter and cut out. My pump will give 65psi so pressure isn't the problem.

I reckon a 120bhp engine needs a pump to pup at least 1 to 1.5 liters/min.

Any thoughts/pump specs from people.

btw, my car typically does 3 mpg which is over 1 litre/mile.

Wil

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

nope but bosch should be able to tell you the spec...

Jim runs a std metty pump and is getting to about 160bhp so I'd be surprised if yours isn't up to it.

Unless its old and not preforming 100%....

Alex

AlexF

3mpg is low though!!! Im hoping to get more than that! Aslong as its double figures then thats all that bothers me!

I am going to check the pump and ask the manufacturers if it is working correctly.

I think it's probably a combination of the pump not beig in spec and because I don't have an alternator the voltage at the pump is around 12V compared to 14V.

I just wondered what the metro pump (and others) pumped per min compared to mine.

Wil

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Yeah good point on the voltage, they do draw a big current so will probably pull it down lower than 12v

Your engine can't be very well set up... Power is theoretically proportional to fuel economy for well set up engines; hence unless you are making 300+ hp, then you are probably running waaaay too rich...

Why not get a std metro pump on the job and take it from there?

Why don't you take it into work put it on a variable voltage supply and see what the difference in flow is between 12 and 14 volts. I think you will be supprised at the difference. If you think about it it is like taking away 15% of the flow and pressure capabilaties. Also you have to consider that it can produce so many liters a min OR 60psi, not both at the same time. We need either a better pump (where even with the pump derated at 12v it will still be sufficient) or a voltage multiplier to restore the voltage to 14V.

Oh and the engine is quite well set up it is just that it is a track only car so it is always flat out. For example I took my modified 998 on the track last week and on the road it does about 20mpg (and that is badly set up) however on the track it only managed about 7mpg.

Ben

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

ahhhh - didn't realise the 'track only' mpg...
Still sounds a little extreme - what is one lap of combe? 1.5 miles???

don`t mention combe ,i`ve just had the price list for this years action days !!!!
no more feebies and 25 quid for a session .FM.

Everyone knows that instructions only have to be read if the thing doesn't work....

Right I've tested the pump. and it pumps approx. 1 litre/min. The spec. of the pump is around 2.5 litre/min.

The voltage at the pump is around 11.8 V. Even taking this into account it should be more, and this is what it pumps at zero pressure (i.e. not restricted). So as soon at the pressure increaces I'd expect it to drop further.

I think the pump is knackered and I'm going to contact Facet next week.

I reckon a Metro pump would work fine, anyone got one to sell?

Wil

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

That is quite a short fall in flow. Can you try it at a higher voltage? Try using the subaru battery while the engine is running and see the difference, at least you will know then how much difference it makes to even a knackered pump.

When we did that test at Curborough the voltage drop across the relay was enough to slow it down and that was only about 0.8V.

Ben

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

IIRC Metro pump is quoted 90-120 litres/hr at 4,2 bar nominal pressure. For each hp you?ll need roughly 0,5 litres fuel /hr.

The same pump is used in multi point efi Vauxhalls ( a sad thought isn?t it...)

do you guys think that a 95psi pump can work on the mini turbo. maybe the pressure would be too high?

i am building a turbo and i would like to know if this one i have (brand new, bought it for another car) can work, before considering buying a different pump

'I swear to use the Boost, The whole Boost'
'And nothing but the Boost..... So help me God'

The pressure is not a problem as you use a regulator to reduce this.

i might have to disagree a bit on that iain , i run a 95psi pump , on the rollers max power was found by knocking the boost back to 12psi as above that it was overfueling and sending flames out the back.Now it is either over boosting or over fueling???
I now have a fuel pressure gauge which i will fit in car and plum in just before the carb and see that happens as i open up the boost .
It could be a miss match of parts thats the problem ie a 95 psi pump with a fuel reg only designed for a 45psi pump , i will also try it with a metro pump and see what that does , and try different regulators to see if they are at fault.

Just got to get it running first.lol.

Everyone knows that instructions only have to be read if the thing doesn't work....

Having seen what was happening on Marks motor last year, i have to agree...
It could be that pumps designed for 'modern' engines with a large common fuel rail have a very high flow rate to keep good pressure across the injectors... If this flow is more than the 'small' regulator as found on the metros can handle, then pressure will rise disproportionally as the regulator is unable to get rid of all the fuel...
As Mark points out, a simple fuel pressure gauge next to the boost gauge will show any problems...

Yeah thats a fair point, everything will have to match. I guess its easiest to stick with tried and tested parts! :)

If there is a regulator to match that pump though you should be ok.

so if i get one of the more modern rising rate fuel pressure regulators then i should be OK?

'I swear to use the Boost, The whole Boost'
'And nothing but the Boost..... So help me God'

If you get one thats designed to take the right pressure from the pump then im guessing you'll be fine.

thats what i was thinking.

i can get one desinged to take 95psi

'I swear to use the Boost, The whole Boost'
'And nothing but the Boost..... So help me God'