32 replies to this topic

[MartinS]

I was under the impression that if you are going to be producing nearly 300 bhp that the standard fuel pump isn't up to it?

 

Is this correct or does the standard na pump do the job?

 

Martin S

 

[CHILL Gone DUTCH]

All I can tell you Martin is the 255 was to pump runs out of puff around 330hp Hope it helps

[JG]

and that all walboros are shit. 

[Nev]

I was under the impression that if you are going to be producing nearly 300 bhp that the standard fuel pump isn't up to it?   Is this correct or does the standard na pump do the job?   Martin S

It's a bit of a lottery really. I think when new, with a clean pick up filter they would be 100% fine delivering fuel for 300 BHP. But as the pumps have now worked for hundred of hours in our 10+ year old car they are likely getting tired and old (like the owners!).

Edited by Nev, 15 June 2015 - 05:27 PM.

[Kieran McC]

I had to have a new one fitted to mine ,It was fitted when the conversion was being done.

[scw02102]

Im sure MBES2 has over 300bhp on a standard fuel pump

 

He has since upgraded but was running 300+ for long enough

[P11 COV]

I'm on my original fuel pump. 300bhp and 60,000 miles. Never noticed a lack of pumping power.

Edited by P11 COV, 15 June 2015 - 09:43 PM.

[mbes2]

Im sure MBES2 has over 300bhp on a standard fuel pump

 

He has since upgraded but was running 300+ for long enough

 

I upgraded from std to a 255 pump because of a problem at high revs going in to limp mode with fuel error codes

 

it had 57k on std pump & filter... which looked like this when removed.

 

 

Turned out to just be a relay problem ...  ... but was happy to have it replaced after seeing above finding.

 

plus it was something I never upgraded... so couldn't help myself 

[Bumblebee]

I'm still on the std pump and running 300hp but maybe it's something I should look at upgrading although I've not had any probs so far

[Nev]

I'm still on the std pump and running 300hp but maybe it's something I should look at upgrading although I've not had any probs so far

It may never be a problem, just keep an eye on the inside of your exhaust tip colour. If it changes to a light brown/gray colour then you know it is likely under-fueling.

Edited by Nev, 16 June 2015 - 06:51 AM.

[Bumblebee]

Cheers Nev

[MartinS]

Mines always had a light brown grey colour on the exhaust!

 

Have bought a Courtenay 450 pump so may as well use it I guess.

 

Martin S

 

[Spitfire Engineering]

https://pandlmotorsp...el-pump-450lph/

[mbes2]

Above link... 

 

NOT meant for use in a stock or lightly modified vehicle with less than 500HP, the use of this pump in that type of application will result in severe drivability issues and/or damage to the vehicle.

 

From CS

Uprated Fuel Pump - 255 & 450

Uprated in-tank Fuel Pump. On modified cars fuelling is critical, and OE pumps are known to fail. These Walbro pumps are direct replacement for OE and fit in the original housing. The 255 pump is capable of running at up to 255 litres per hour at 3 bar pressure, the 450 pump at 420 lph at 3 bar where greater fuel flow is required. Fits in place of original pump, with modification to the OE housing.

 

Convoluted Flexi Plastic Fuel Hose Available

 

255 Pump: £102.30 

http://www.courtenay...o/prod_719.html

 

450 £139.00 

http://www.courtenay.../prod_1107.html

 

I know when I spoke with CS they told me the 255 was good for 350bhp on cars they fitted

[CHILL Gone DUTCH]

No expert but I think SC cars require more LPH than a turbo

[siztenboots]

Im sure MBES2 has over 300bhp on a standard fuel pump
 
He has since upgraded but was running 300+ for long enough

 
I upgraded from std to a 255 pump because of a problem at high revs going in to limp mode with fuel error codes
 
it had 57k on std pump & filter... which looked like this when removed.
 


 
Turned out to just be a relay problem ...  ... but was happy to have it replaced after seeing above finding.
 
plus it was something I never upgraded... so couldn't help myself 

I'v noticed bits of the fuel filler neck breaking away so suspect they will look like that filter picture above

[Spitfire Engineering]

No expert but I think SC cars require more LPH than a turbo

 

Correct!

Well apart from it's the other way around! and it's BSFC you are probably referring to.

No doubt you were teasing us.

 

Gaz

 

 

PS It's really not that complicated choosing a suitable pump but it does need to be calculated and you do need to adjust the unit to match or you may end up with a HP solution which is noisy, and strangely suffers starvation in corners which you would think is the exact opposite to what you expect. Not to mention fuel heating, etc.

[Spitfire Engineering]

Mines always had a light brown grey colour on the exhaust!

 

Have bought a Courtenay 450 pump so may as well use it I guess.

 

Martin S

 

 

 

I await the subsequent thread with bated breath!

[MartinS]

so reading this, I may as well stay standard or as its old, get a 255 pump and 100% definitely not use the 450 pump?

 

 

Any suggestions guide welcome as am well out of my comfort/knowledge zone with all this stuff.

 

Martin

 

Edited by MartinS, 17 June 2015 - 09:52 AM.

[Spitfire Engineering]

Well the only certainty is you definitely do not want to be using the 450, it's horrendously overpowered for your application, it even has the disadvantage of ticking all the boxes, overheated fuel, noisy, you needed a rewire of the pump harness and it if you try to install it into your current unit you may well damage something, I thought the comments about damage on the above link was scaremongering a little but in the case of the Delphi unit (VX) it is actually possible as the return line is restricted and will not cope with the fuel flow, this means the reg cannot dump correctly so you may see an overpressure at the rail. If you are lucky you will blow one of the safety caps off  of the return line in the unit but then the canister will not charge at all.

 

U2U me and I will give you some sensible options to think about. we have done about a 100+ pump units for the Elise S2 and VX without issue and with very good sound results considering you are way up on output.

We need your power output, future plans on output? rail pressure and boost pressure if applicable. Basically we re-work your unit and install a modern, high efficiency turbine unit matched to your requirements the unit return system is then matched to the pump.