Spec of a mutro pump
Turbo Mini Forums

I've been having issues of fuel starvation.

i was wondering what the flow rate of the metro pump actually is?

i've noticed as well i'm only getting 11.5v at the pump and just over 12 at the battery. The alternator is only a small one but does keep the battery fairly well topped up, just runs at about 12.8v when giving it some welly.

now i'm guessing the wiring used for the facet pump before isnt as heavy as the metro pump needs, hence the voltage drop, so i'm going to fix that temporarily for MITP as i dont have any time to mess about.

Just wondering if there is anything else and what sort of flow i should be getting round the circuit via the return with it not running?

If i can figure that out, then i can either blame the pump, or i can look at whipping the carb off and drilling out the float needle valve to give me some more juice.

If i had more time i'd do all the tests i need but unfortunately i dont.


The other thing is i'm guessing a slightly goosed/inefficient pump. it is new although for some reason over winter it seized and took some banging to get going again!

i know they have small rotors that centrifuge out so it could be one of those not doing that reducing efficiency, or even a tight bearing not giving enough speed.

All in all, a pain in the arse

What exactly is the fuel starvation problem?

The pump needs to be pumping 1 litre a minute, an easy thing to check.

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

Iain, are you using a red top type battery?

I bought a new one last week, on the info that came with the battery it said that in order to charge the battery the alternator must put out 14.2v. maybe this is your problem??

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metro pump is good for power figures a shade under 500 bhp

Basically after a hard run of about 1-2mins it starts to run lean and splutter, go easy and its fine, let it idle and you can go for another short hard drive.

1 litre a minute is what i was looking for, to be honest it doesnt seem that much.

I'm not using a red top, just a sealed battery that was with the car, then got replaced by me. its from a lawnmower or something.

1l a min sounds what i worked it to be

say 10mpg, 120mph = 12gal per hr

roughly 60 litres so 1 litre per minute to sustain a flat out run with plenty of margin.

To be honest, either the battery lasts well from a charge, or the alterntor must charge it as i did a RR session, and some more running, probably 20-30 starts and its still got plenty of power in it.

I think the pump is goosed, but i will check and that was my plan. just wanted to know a figure.

if it helps my metro pump put out 500ml in 11 seconds when i was testing if it was flowing enough.

bud, was that via the return or just straight from the outlet?

also was that just off a battery that wasnt being charged.

basically i think its the pump, hopefully i can do some more tests this weekend.

that was out of the feed, just took it off the carb so after the reg aswell. was just with the ignition on so 12V not being charged.

12.8v from the alternator is v bad, maybe start simple and sort this?

I've seen the future and tbh its Pie

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

its not bad for the size of the alternator trust me

its not a normal alternator, its a fixed magnet one.

Yeah i was thinking voltage was not the issue as i knew you ran just from a battery will, as does JF.

Works well on a small digger though ay!

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1/4mile in 13.2sec @ 111 terminal on 15psi

Yup!

Only reason its only crank out 12.8V is that its not reving quick enough, just need to alter the pulley ratio's.

it was geared for a mig going flat out all the time so not suprising it doesnt suit mine that well. still it keeps it topped up.

i'll try and do a flow test this weekend but i'm sure thats the issue. just have to buy a new pump and hope for the best

the pump was new last year!!

We did have a similar problem on the TT. We had a big volt drop through a relay that had worn. When we put a wire in that bypassed the relay you could hear the pump speed up. In the end though we did find that the pump was kaput.

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