Quick question, i need to uprate the fuel pump in my cinq to 3bar to run the MPi. Does anyone know of a replacement in-tank pump that I can use for this, or do I need to use a proprietory external pump (Sytec etc)

I'm guessing this is a std question for the turbo's amongst you...

Cheers, John

Cheers. I'd sort of worked out anyway, just couldn't see the wood for the trees. I was staring at a Punto75 pump unit trying to work out why it looked nothing like the cinq one. Then I noticed the pump itself is a separate unit and interchangeable.

John

A direct replacement for the fuel pump is the pump from a Ford Escort MK5 RS2000/Sierra 2.8V6 XR4X4/Granda/Scorpio 2.8 V6 etc, it can run upto 5bar and flows fuel at a better rate than the pumps from the MPi Fiats. This is what I run and its brilliant, I have a very smooth running car now and no issues whatsoever in terms of running lean at top end.

Walbro pump can be bought new from www.fuelsystem.co.uk for £80ish.

Aaron.

Great that's worth knowing. I guess i'll see how this one goes to start off with.

On a related point, does the additional pressure cause any problems with the std pipe connections? Can a std spi fuel filter be used? And does the uprated pump run the same rated fuse?

Cheers, John

nitrane.co.uk said:

Great that's worth knowing. I guess i'll see how this one goes to start off with.

On a related point, does the additional pressure cause any problems with the std pipe connections? Can a std spi fuel filter be used? And does the uprated pump run the same rated fuse?

Cheers, John

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I run same fuel filter, not had any issues with it, tho you could as precaution change to the MPi filter, if its even differetn i don't know have never checked part numbers.

No differance on fuse, and mine has been fine for the or so months mine has been in.

Fuel pipes are meant for fuel injection, so even tho the system as standard is low pressure for a fuel injection system, its still much higher than a carb system which runs at less than 1/2 a bar. I had the fuel pipes checked and they are lined with something if you look at cross section of them and thats why they are fuel injection pipes, so I'm told and again mine have been 100% fine.

Aaron.

the standard hoses etc (irrc, please check and don't quote me on this) are good up to just under 5 bar.

aaron, got a part number for that pump?

arc said:

the standard hoses etc (irrc, please check and don't quote me on this) are good up to just under 5 bar.

aaron, got a part number for that pump?

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I only know there own part number as found here http://www.fuelsystem.co.uk/itplist210205.pdf

sorry to drag this up again just got back from rolling road station the guy says theres not enough pressure on the fuel so to come back when its sorted, are those pumps on that site copys of originals? exact copys? if i was to go to a scrappy and get one from a 4x4 siera would it fit straight in?

cheers

gaz

Do you have a fuel pressure regulator set up as i showed you on your other thread? And did you check/adjust the pressures as advised?

I would advise to never use a 2nd hand pump from an unknow source, i.e a scrap yard, as they are so cheap new, whats £80 for peace of mind, against melted pistons/blown engine.

And those pumps are not copies as you put it, they are Walbro pumps.

yeah its got the fuel reg on ect.... the guy says its fine upto 4000rpm then it goes crazy as the mixture gets lean, pulls like a dream so far but still not driveable till its done properly.

which pump is it i need? the Escort rs2000 4x4 EFI 95> ITP050 AC £80

does it fit directly in without any mods? i dont want to be buying the wrong pump as cash is very low till end of jan (****ing christmas)

thanks

gaz

No you can't drive if its lean. Its pretty much the same conclusion I came to with the car on r/r, the standard pump just is not up to the job, even at 0.5bar which makes you wonder why so many actually lasted as long as they did, either that or the performance claims by VAD were on the optimistic side which i think they were due to fact 0.8~1.2bar (that is the variance on standard car) fuel pressure in 0.6bar turbo boost equals no fuel and therefore melted car.

Yes that is correct pump ITP050 and its a direct fit for the Walbro pump fitted by Fiat. you will have to remove the whole pump assembly and strip the pump out to then replace with this one in the Fiat holder and put it all back together, at most an hour job.

Aaron.

It's worth mentioning that we measured the MPi pump at 3.5 bar, it's the regulator that keeps it to 3bar. We adjusted this to get the full flow which was needed to get the fuel delivery required at the top end.

John

It’s the regulator that controller all pumps pressures.

If you stuck a 5bar pump on a Spi Cento it would still flow 08-1.2bar as set by the regulator found inside the throttle body. This is why I drew a diagram for him showing how to fit the regulator to get 3bar at 2nd injector and check for at least 1.2bar at primary injector, they must be in series not parallel otherwise fuel will always be regulated by eth lower pressure. Must be remembered to measure fuel pressure upstream of the regulator, as it only regulates before it not after it.

What the uprated pump will do though is flow more litres per hour which for a turbo car is as important as pressure cos it will be greedy for fuel at the higher rpm levels where it’s making lots of power and on full boost.

Yet again I'm resurrecting an old thread

Didn't wanna start a new thread as most of the info is here already. Just wanted to know if anyone knew what max flow rates the standard cento SPI pump is and what things like the MPI, 16V etc pumps are rated at so I can get the most appropriate size.

I'm gonna want for pressure 3bar+ and flow rate 1L/min or 98lb/hour. Those specs should be good for 120bhp which is plenty above what I need. Can the standard MPI pumps do this or am I looking at something more beefy?

ETA - Correct numbers and from calcs if the SPI pump runs out around 80bhp then its only about 926cc/min or 88lb/hr. Do these numbers sound about right to ppl?

I would be looking for uprated pump yes, not sure about mpi but spi 1108 is only 54bhp standard so mpi is gonna be around the same and 120bhp is alot more than that!

the pump mentioned by J333EVO above will suit you fine. Although there is an almost endless list of cars with suitable pumps, i've heard of MGF pumps being used, escort rs2000 (what i have waiting to in my turbo), I used a Coupe 20VT pump in my last turbo. Believe a Punto75 pump is also 3bar.

Cheers, although I thought the 1.1 MPI ran at 3 bar not just over 1?

I'll have a look at 20VT pumps then, they seem to be cheap on the bay at the minute and should be more than enough. There's no downside with using a pump too high specc'd is there?

For NA 1108/1242 MPI pump will probably be OK (or even SPI). For race and turbo go with J333EVO.

The MPi pumps run at higher rates than the SPi cars, remember that its not the pump that makes the pressure it the pressure regulator, but as an aside we run the standard MPi pump on our 1.4 16V car which makes about 115bhp with no problem on fuel delivery.

Got a pump from a coupe turbo in the end. That should more than suffice my fuel pumping needs.