High pressure k-jet fuel pump

Evening all,

Has anyone got any experience of using the Bosch high pressure fuel pump B261 205 413 01?
It looks like this could be a direct replacement for the original k-jet fuel pump, for an uprated engine.



From the spec on the Bosch web site, this should be able to supply 8 bar of fuel pressure (which should be enough for a TFSI conversion). http://www.bosch-motorsport.de/media/catalog_resources/Fuel_Pump_FP_200_Datasheet_51_en_2776426379pdf.pdf

Thanks

Lhasa2008

looks fine, but you probably wont need it the oem pump is good for big horsepower already, what spec engine and what management?

From what info I've found I believe the original OEM pump max fuel pressure is approx 4 bar and TFSI i.e Edition 30/S3 engine needs 6.5 bar?

kjet system works at 5-6 bar at all times!

oem pump spec at 5bar is listed as 128l/hr, the bosch 044 motorsport pump can supply 200l/hr at 5 bar, the other one supplies 200l/hr at 8 bar.

but I think you may be looking at the wrong pump
APR 2.0T FSI High Pressure Fuel Pump (HPFP)

rubjonny said

kjet system works at 5-6 bar at all times!

oem pump spec at 5bar is listed as 128l/hr, the bosch 044 motorsport pump can supply 200l/hr at 5 bar, the other one supplies 200l/hr at 8 bar.

but I think you may be looking at the wrong pump
APR 2.0T FSI High Pressure Fuel Pump (HPFP)

So from the info on that goapr link that would mean that the k-jet pump should be sufficient to supply fuel from the fuel tank on the low pressure side of the TFSI fuel injection.

Thanks

Lhasa2008

yup more than good enough

The APR link states that it can require up to 95 PSI which is 6.5 BAR.

How will the K-Jet pump be sufficient if it only puts out 5-6 BAR?

I'm currently building a TFSI K04 Mk1 using the QPENG kit and according to en from QPENG the standard K-Jet pump's are fine.

I'm waiting on a price for a 413 just in case.

the point is, you dont replace the FSI high pressure pump with a kjet pump, that stays as it is

you just need a low pressure pump to supply it, for this the kjet pump would be more than good enough if not way over-spec

Dirrt said

I'm currently building a TFSI K04 Mk1 using the QPENG kit and according to en from QPENG the standard K-Jet pump's are fine.

How's this going? Have you a build thread?  

Did you manage to sort the prob with the pipe from the turbo to the intercooler?

Cheers

Lhasa2008

Hi, no build thread here yet, tbh I find this forums a nightmare to use and it puts me off coming on here.

I have one here http://www.edition38.com/forums/index.php?showtopic=433883&hl=

I haven't went at that pipe yet but I have a few ideas, I'll be going at it before the end of the week hopefully.

Have you got any ideas for it?

sorry I was showing my ignorance of the TFSI system there! Looking at my TFIS SSP manuals (why didnt I before? ) yes the 'low pressure' side of the TFSI system requires 0.5-5bar under normal driving conditions, but it raises this pressure to 6.5bar for hot and cold starts. this pressure is controlled by the fuel pump control unit, without that you will have to supply 6.5 bar at all times I guess? The fuel filter has a pressure relief valve inside it which opens at 6.5bar to maintain the low pressure side.

I dont know what flow rates are required this isnt mentioned, if I could get a VDO/bosch/pierburg part number of a TFSI pump then I may be able to find that out.

I wonder if the kjet pump could be controlled by the TFIS pump controller? I imagine the stock TFSI pump is just a std 12v unit its just a case of will the kjet pump like being driven by a PWM signal or if it will pack in. you will need to fit the low pressure sender G410 so the ecu can control the fuel pump module as well, I'm not sure exactly where that is located so this may present an issue as well if its in the main feed line as I assume you will be running your own…

anyway in short a normal kjet pump will probably be ok, it depends what flow rate the high pressure pump needs under normal and cold/hot starting conditions. if relatively low then the kjet pump should be fine to deliver the 6.5bar of pressure required

Hey, sorry to hijack the thread.

i have a TFSI in my mk1 golf but seem to be going through fuel pumps cavitating like nothing else.

Currently using a external 6 bar fuel pump, goes from the tank, through a high flow filter, through the 6 bar pump, up to the standard mk5 golf filter with a 6.6 bar pressure relief valve, and then on to the engine hpfp. this is all squeezed into a rather small space just infront of the RH rear wheel.

the pump is supplied with a constant 12v, and the ecu is programmed to think the fuel pump is being supplied with 98% capability of the fuel pump at all times.

the car seems to take an age to create the required pressure on start, pump runs for 10 seconds when ignition turned on until it cuts out, and it can take over 10 turns of the key to prime the system to the required pressure.

i have replaced the fuel pump, and also the OEM fuel filter, incase the relief valves were failing. it seems odd to me that the system is loosing enough pressure over a few days to have to require many turns of the key to prime the system again.

i have replaced the fuel lines from he tank to the pump with I/D of 15mm as that is what the pump required the I/D of the hose to be.

the I/D of the hose from the pump to the engine is 10mm

could the fuel hose I/D be too large and so it isn't able to create enough pressure? i haven't had this issue before but it now seems to be one, which to me indicates something is breaking down or failing?

i am trying to think of a way to troubleshoot this further, any thoughts or information known about the required supply of fuel for a TFSI is greatly appreciated.

also any information about pump installation position also appreciated, its currently below the fuel tank outlet, so it is always supplied with fuel.

thank you

 

what fuel tank setup have you got? maybe you need to add a swirl pot and pre-supply pump to keep the external pump fed

its the standard mk1 gti tank, so i believe it has an internal swirl pot? do you know of a system to install an internal tank pump?
 

right, so long as the internal swirl pot is in good condition you should be ok, worth a check as the internal seals break down:
https://vwgolfmk1.org.uk/forum/index.php?page=topicview&id=how-to_2%2Ffuel-tank-cleaning_3&kfs103=30

though even if the pot seals were gone it would only be an issue when cornering with low fuel it wouldnt cause the other symptoms you're having unless the pot was blocked up somehow.

perhaps the pump is starting to die, or maybe the non-return valve has failed (assuming its still in the pump and wasnt removed and a barbed banjo adaptor fitted in its place)

to fit a pump i9nside the tank you would need to break up and remove the swirl pot or fit a carb fuel tank. then drop a 84-on cabrio & scirocco or g40 shape polo lifter pump in, then fit an external swirl pot between it and the fuel pump. though by the sounds of it you may not have the room to do so…

ok great, i shall look at cleaning the swirl pot and its condition, the pump is brand new, with a new pressure relief valve.

As a last resort i think i may look at using the spare wheel well for an external fuel tank, and have a lifter pump to take fuel up to the external tank and use that as a make shift swirl pot, seems to be the most cost effective and reliable solution i can come up with!

thanks for your help