Hi All,
On classic's there was 2 common issues about the Fuel pump IIRC :rolleyes:

1) 1/4 tank around tght right-hander fuel starvation (lean out the POP :(
2) Engines like 2.2ltr and 320+ Pump did not have enough volume

On the STi7 No. 1) is not a problem :D:D

my question is can it cope now it's PPP'd and is there a test or as with the classic's an Upgrade Pump ? Worth it or not ?

Tony

Ps Whoops should have stated this first :rolleyes: One Sti7 PPP had low power due to Faulty Fuel pump. Take it easy on me boys ;)Flame suit ready. God my computor spells rubbish :(

[Edited by T5NYW - 1/24/2003 6:59:46 PM]

Tony,

Just to let you know the STI7 still does suffer from fuel starvation, I know cos it's happened to me and many others.
I think a uprated fuel pump is a good idea, however going on IM's decisions lately regarding non OEM parts where would we stand?

Cheers,

Rob.

ECUTEK fit an uprated fuel pump as part of their STi7 upgrade, so they must know something!

I was thinking of replacing it as a precaution I don't fancy mine leaning out :( then going BANG :(:( and not as a performance upgrade :rolleyes: I will ask my dealer to by and fit :) Don't want problems with IM :(

Tony

Tony, I wouldn't do that just yet mate.

Do you know something we don't Russell?

Russ,
YHM

Tony

Tony

YHM too.

Russ

Russ,
Better let this tread die out and wait to see what happens.

All the STi 7s I will be mapping will have an upgraded fuel pump and a knocklink otherwise I won't map them. Speak to Power Engineering.

[Edited by john banks - 2/7/2003 12:03:37 PM]

John,
Many Thanks :) with us UK model's the price wasn't the issue :D if I can replace it for £150 and save a 3 week rebiuld :eek: I will :D but not at the risk of loss of warrentee :(

Tony

Come on guys, spill the beans!!!!

John,

Do you know who makes the pump that PE are supplying?

Matt :)

Russell,

Could you please mail me what you know as I had a chat today with someone who told me that the OE STi 7 pump has been measured for flow and is not up to the job.

I'm going to try and substantiate that but in the mean time, can you tell me what you know?

Does anybody have any knowledge of STi 7's that have either had the fuel pump fail or a problem/blow up blamed on the fuel pump? :eek:

Cheers,

Matt. :)

Matt

I think I must have spoken to the same person as you.

The actual flow rate required versus what the pump supplies the injectors is pretty scary.

Nathan..

Nathan,

Got any more details? (mail me if you like)

Ta,

Matt.

Wow this looks scary indeed.

Can I use any good quality fuel pump (ie: a USA sourced pump) or does it have to be a specificly designed pump. Is the only factor I have to look for the litres it flows per second etc ? If so, what is the litres per second I need to source ?

Is it easy to install ? Can a general car mechanic install one easily ?

Cheers,
Ray

Ray,

Aparently it's quite easy to do it yourself as many peolpe on here have done. I don't know what pump to get but Mark Aigin @ Lateral Performace supplies them as do Power Engineerins (I believe).

Bob Rawle also mentioned that if you uprate the pump then you may need an uprated Fuel Pressure Regulator as the standard one can be overpowered by the pressure from the new pump.

Ta,

Matt :)

Thanks Matt,

However, I would much rather pick one up from the USA as it is so much closer to me than the UK.

Anyone can supply the specs I need for both the fuel pump and fuel regulator ?

Cheers,
Ray

The guys who are mapping STi7s ie Bob Rawle/Pat etc all say that an uprated fuel pump is 'highly recommended.' These guys map the cars so thats good enough for me.Uprated mine a couple of weeks ago.Not letting my engine go bang for the sake of a hundred quid.

Matt,
Thanks guys for doing the measuring :) but I doubt if IM will do a recall though will just do the induvidual ones that give problems :( or POP engines maybe :eek:

If I change the Pump and regulator and engine still POPPED I would have the blame and £5,000 bill :rolleyes: but If the pump is O/K at the moment :rolleyes: but one day short changes the injectors and POP IM picks up the bill :):D and car off the road for 3 weeks :(

Tony

You can´t use every pump in the WRX from MY01! If you fit a pump like a Walbro GSS341, it draws too much current and the standard fuel pump controller can´t supply enough power. Result: LESS fuel at high revs! You have to take a pump which draws about the same current as the standard pump. I did some testing with different pumps and for me the pump that is supplied by PE is working well. (I don´t know how it will cope with the 660 cc injectors who are on the way now, but it works perfect with the standard injectors even at 95% DC)

Mark.

It is incredible that, as T5WYN says, if you fit this yourself, to protect your investment, you may have voided your warranty.

We will not map a 7 unless this is done.

Can someone post the model number, brand etc (whatever info I can use to source one over here) as well as the model number and brand of the fuel pressure regulator. I would like to buy from you guys but it is the whole distance issue. Hopefully I can pick up the same fuel pump and fuel regulator right here.

Thanks,
Ray

Have been reading this thread with interest. Who knows if this is the same pump as used in the 01 WRX?. I have become a little concerned if the same problem of fuel starvation could exist in a PPP WRX.

Nigel,

I would say that from Mark (EMS) has said, the pump is different so it sounds like the WRX is not an issue. This would make sense as the STi needs more fuel......

Mark, do you know which pump PE supply?

Cheers,

Matt.

I have been lead to believe, that the problem is due to the later ECU dropping the voltage, and this is causing the fuel flow to drop dramatically.

It appears that the only real solution, is to have a direct 13.5 volt direct feed to the pump.

The pump kit that is an easier fit, for the STi7, is the Walbro 342 version.

Mark.

Mark,

Thanks for that. Are you saying that the pump in question should be fed 13.5v to work properly or would it work as a direct replacement, but would work better powered directly? Do you agree with Bob R that you should also uprate the FPR at the same time and if so, which one?

Alex,

What follows is a quote from this thread from Rich @ Powerstation:

Quote:
Yesterday I had an STI 7 on the rolling road and I thought I would investigate the fuel pump to see if was as bad as everyone said.

The first thing that we noticed was the fact the pump runs at 2 speeds. For the first 30secs of the engine running the pump runs at 12v, it then switches to 6v (at this point the fuel pressure drops by 0.2bar) The maximum (lockout) pressure the pump could produce at 12v was 6bar and at 6v it only made 3.5bar

The pump remained at 6v until the boost went over 0.5bar where it switched to 12v.

We then did a power run, at about 3000rpm we clamped the fuel return pipe to force the pump to produce its maximum pressure. Sure enough the fuel pressure jumped to 6bar, but as the rpm increased the pressure dropped away until at 6000rpm it was only producing 4 bar.

This proves the standard pump is not man enough for the job by a long shot. It cannot produce the flow and pressure required by a bog standard engine let alone a modified one. I would advise any sti7 owner with any kind of mod on his car to replace the pump ASAP as there is a huge risk of engine damage.

The car we tested was a 1500 mile example, so God knows what the pump would be like after 50,000m

There is a high pressure pump kit available @ £130.00

Rich"

Matt :)

I have rang my Dealer to ask if I bought a new pump "Would it affect warrentee" he said "Probably YES :(" but he said Prodrive were working on the 'Problem' for the STi8 and as not much difference to the STi7 might get a retro fit :D but as the 8 can be EcuTek'd and the 7 is Piggyback maybe not.

Tony

Ps this told me by my Dealer and not anyone from Prodrive so cannot confirm his statment

All very worrying, I hope things are sorted soon, for all any of us know, every time we push our cars a bit harder than normal we could be accumulating damage to our pistons/engines.

I'm off to P.Eng for a rolling road day on Saturday to see what figures I get from the PPP and to check for any signs of det etc.

If anyone has any info they would rather not post that is relevant, please e-mail me off the board, I will treat it confidentially of course.

Matt,

Yes, apart from the stock pump being hopeless, the fact that the ECU drops the voltage, and at best only produces 12v, doesn't bode well for those wanting to run high boost at the top end.

There abviously several people trying to solve the problem :D

Mark.