Standard Metro Turbo fuel pump - psi and lph ratings please!
Turbo Mini Forums

Folks,

I've been seaching high and low (internet, mostly), and can't find much in the way of reference to the actual outputs from a standard MG Metro Turbo fuel pump. Can anyone shed some light, other than to say that anything from 40-65psi will be okay?
Incidentally, two things:
1. Someone on this forum stated that a standard pump produced 36psi (or so). Why would this be the case - isn't it just 3.5 + 7 psi that would be needed for a standard engine?
2. My car has the standard 1/4" supply and return lines, so I imagine my choice of fuel pump may impact upon how well these cope. More pressure = more flow, but also more to send back to tank.

Thanks for any advice.
Matt

As far as i can tell any fuel injection pump will do the job, you don't really need to know what the pump out put is, if you set what comes out of the reg at around 4 -5 psi. this should be ok.

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Thanks. Problem is, I'll only know if the reg can reduce to what's required once I've bought and installed the pump. When you say "any injection pump", what pressure range are you talking? I doubt the reg could handle 100psi, for example....
Cheers
Matt

The differential fuel pressure an SU carb works at is ~4psi. What you have to consider is the boost pressure you will run as well. Gauge fuel pressure will be the sum of the boost pressure and the differential fuel pressure. So, 15psi boost and 4psi differential equates to 19psi fuel pressure you would see on a gauge.

The turbo pump is a fairly common type bosch unit and is used on several other cars. It's also used on fuel injected cars with fuel pressures of 45psi.

Flow rate Im not sure, but I think that its fine on anything but the most extreme power levels.

Yeah, BL would have just picked a pump off the shelf rather than specifing a special pump. Also, don't for get that the Metro pump was not run at 12V, mprelike 9V

From a regulator point of view 65psi is safe, but people have damaged tham at higher psis. However the diaphrams may have bben worn anyway.

Edited by wil_h on 15th Feb, 2009.

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I don't think the metro pump will do a typical EFI fuelling setup, especially a turbo one - I'm sure folks have tried - and failed.

I could well be wrong Dave. The package is almost identical to severl EFI pumps, but that doesnt mean its the same inside, of course

Thanks to all; I'm happy to go and buy a pump now! Here in Aus, I can't tell the motor spares shop I want a metro turbo pump, so I have to tell them what pump I do want...

The Bosch part number is 0 580 464 070, and a quick google search has thrown up 102 l/hour 94psi.

Tha same pump was used on the Maestro and Montego 2.0l EFi engine (without the ballast resistor), and a myriad of other cars, so it should be more than capable of anything you need it to do.

My googling seemed to bring up 130lph and 3 bar (44psi). Either way, it seems that this is the very same pump fitted to the Holden VL Commodore here in Aus, so easy to get. Cheers.

Sorry about that, I noted the wrongs stats. It is indeed as you state.

Hi,
Any injection pump that runs on a 3 bar system should do the job.
The pumps to steer clear of are the ones for the mechanical Fi systems which run 7 bar regulated.
Cheers,
Gavin :)

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have a dig about on here,
there is a list of pump part no's and flow/ pressure graphs.

Holy Thread revival!!!!
Looking to buy one of the Sytec injection pumps as it suits my needs with regards to threaded fittings.
My question is that I have a choice of two potentially suitable pumps, differing by their fuel delivery flow rates and maximum pressures. I obviously want to get the lowest flow rate and pressure so I am not making the regulator work overtime.
The suitable options are:

Pump 1 - max pressure of 2.3 bar - flow rate of 135 ltr/hr @ 2 bar

Pump 2 - max pressure of 6.5 bar - flow rate of 156 ltr/hr @ 3 bar.

The thread has differing views which is why I am after a more concise answer.

Many thanks
Billus89

2.3 bar one is plenty! Your not going to need 135lph or over 2bar

a max pressure of 2.3 bar may be enough, but sounds kinda low tbh, most injection pumps can do well over 3bar,

and tbh id argue that a regulator is doing more work on boost than it is sat returning all the fuel you can send it at idle
135lph is enough for 350+ bhp with my rough calcs

i would pick pump 2 because of the same reason i would choose the mpi over spi tank
- i dont want to be limited by fuel pressure

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So Brett, your thoughts are that although pump 1 can supply 135 ltr/hr which we'll exceeds what I need power wise, you would choose pump 2 because of its higher pressure?
Thanks for your view btw both Brett and slater, as you can see conflicting views are why I don't yet want to part with any cash.

Billus89

yes it can fuel for lets say 350hp, but the boost we would have to run to get to even 200hp will far out pressure what the pump can deliver

pump 1 can fuel for around 20psi boost BUT that is max pump pressure i would like a little head room at least anyway
if your not going to boost higher than 20psi max go with pump one

the usual advise given is go with an injection pump... most injection cars run 3 or 4 bar fuel pressure

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Just be careful of over-pressuring the regulator, 6.5 bar is about 95psi, which is more than the standard regulator will be able to take I believe

Pump one at 2.3 bar will produce say 30psi fuel pressure (actually 33 but leaving a little headroom) and then take away base fuel pressure as say 4psi, and the max boost that pump is capable of keeping up with is going to be around 26psi. The mpi pump is 3 bar and that's far more than an a series will ever need. Pump 1 will be more than capable of what you will probably throw at it.

Edited by Carlzilla on 2nd Jul, 2014.

Edited by Brett on 2nd Jul, 2014.

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Haha, but yeah it's best to underwork some parts, but obviously not by too much. I know what you mean Brett, best to always leave a bit of capacity to be on the safe side

If you are concerned about excessive pressure/flow overcoming the regulator, all you need to do is put a restrictior at the entry to the regulator, such that the return line all the way back to the tank has a larger flowrate than the inlet to the regulator itself. That will prevent any issues or concerns, and is a good way of ensuring the regulator will work properly.

When I was running a walbro 255 with the Malpasi regulator, I had 5/16" supply and return, but had a 4mm ID orifice in the fitting jut before the regulator. I was able to easily suppress that 100+psi potential down to 1.5psi minimum; without the restrictor lowest it would go to was 7psi...