Fueling Issues

[jakey 1]

Right yet more problems with the 205! (8v)

 

Firstly, can i have the 100% correct way for the fuel piping to go!

 

I'm not outside but i think mine goes (standing at the front of the car) from the right fuel pipe from tank, to the bottom of the fuel filter, then top of filter to right handside of fuel rail, then out of the fuel pressure reg to the left pipe back to the tank.

 

I need to sort this out 100% correctly before any othert problems are solved.

 

My other problem being, that due to butchered wiring in UBW, my mate had to whack the fuel pump on a switch, but every time, this is turned on, it unbelieveably floods the chambers.

 

So we started the car to burn all the fuel off snd start again, but amazingly the car was running for 5-10 mins, being revved up too, and not conking or spluttering at all, and this was WITHOUT the fuel pump on!!! :S

 

A few things that have been thought about could be the co2 meter not being set right at all. The FPR leaking, and thus sucking in fuel from the return pipe? Somehow coming in from the fuel filter?!

 

Has anyone had any experience with this before?

 

But as i said, first port of call is that all the fuel pipes are the correct way, so if someone could confirm the correct way that would be great!

 

Thanks

[kyepan 291]

Mine is an mi, and it comes out of filter, into the left hand side of the rail, then out of the fpr and to the tank return. Either way, your FPR is after the rail, hence keeping pressure in the rail metered, so yes that sounds correct.

 

is it flooding with the engine off, when the pump is on? as the injectors would have to be open for that to happen... and they don't open unless the ecu tells them to be.

 

Flooding or running super rich / lumpy as a bag of potatoes may be due to incorrect air metering at idle (ie a leak) and or problem with the water temperature sensor being shot. Have you removed any brackets attached to the inlet manifold? as there is a bolt that goes straight through to the inlet tract? try taking off the air filter and moving the paddle in the afm slightly by hand (or poke a stick down) if moving that gently through a range gets the car to run, you definitly just have an air leak.

 

hope this helps.

 

Cheers

 

J

[bazil_205gti 22]

Hi there mate im sure if your at the front of the car the fuel supply from the pump should be the pipe on the left, and the pipe on the right is the fuel return.

 

Matty

[jakey 1]

Yes that's what i thought, and thought what i did too, i will double check tomorrow, as this could be a simple fix i am hoping!! :S

 

Cheers Matt

[steve@cornwall 100]

from what i remember, the unions are different sizes so the fuel lines only fit to the right places.

[Masekwm 2]

 

[jakey 1]

No one got any ideas?

 

I changed the FPR for an adjustable one that was on the old car (so i know it works), turned the AFM Co2 metre right down, and unplugged the fuel pump completely and the car will still start and run with no fuel gettiing to it!

 

Argh!!!!!

[Masekwm 2]

With the pump unplugged, undo the fuel line from the rail put it into a coke bottle and crank the car and see if you get fuel.

 

You can then use the fuel it's pumping to light the BBQ.

 

I don't think the fuel pump switch is wired in correctly and you need to check the wiring.

 

Irc - There is a relay, tachymetric that controls fuel.

[jakey 1]

I think simply, the fuel pump needs to be re-wired into the ignition as it should be!

 

But i will need someone to do that, as i simply don't do wiring!! :S

[Masekwm 2]

Marc - Zaust does auto electrical work maybe worth a call.

[kyepan 291]

we seem to have some things that need clearing up

 

the car will still start and run with no fuel gettiing to it

it will only run with about 14 parts air to one part fuel... so there must be enough fuel for it to run, otherwise you've just invented a perpetual motion machine that only runs on air, that might not be a lot of fuel, but some fuel IS needed.

 

My other problem being, that due to butchered wiring in UBW, my mate had to whack the fuel pump on a switch, but every time, this is turned on, it unbelieveably floods the chambers.

 

So we started the car to burn all the fuel off snd start again, but amazingly the car was running for 5-10 mins, being revved up too, and not conking or spluttering at all, and this was WITHOUT the fuel pump on!!! :S

 

This switch you speak of... it sounds suspect, has the pump wiring been bypassed completely with a live 12v feed, or is this additional wiring... to make sure it is actually getting 12v...

 

again... it won't run with the fuel pump off... so either your mates wiring is suspect or it's something else.

 

 

I changed the FPR for an adjustable one that was on the old car (so i know it works), turned the AFM Co2 metre right down, and unplugged the fuel pump completely and the car will still start and run with no fuel gettiing to it!

 

the thing about fuel pressure is it has to be set correctly, too much pressure and the engine will flood, too little and it will not run and be lean. Putting an adjustable reg from "another car" without setting it using a gauge is like pissing into the wind with your tongue out.. the pressure could be WAY out and you would have NO way of knowing...

 

 

I suspect it's been bodged, more bodgy wiring really won't help, you'll just end up chasing your tail.

 

I would also suspect the following:

 

Fuel pump is either dying, or it's getting less than 12 v, hence not getting up to pressure

You're Adjustable FPR is probably supplying the wrong pressure of fuel, the injectors will be opening as per usual and then pushing too much in..

If the extra fuel pump wiring is making it run rich.. then it's probably giving the pump the 12v it needs... and then the incorrectly set FPR is dumping way too much fuel in.

 

 

Check the voltage getting to the pump using a volt meter, if it's getting less than 12v...

 

look at the haynes injection loom diagram and run a new feed from the fuse board to the pump, solder and seal the joins. Secondly check the earth for the fuel pump in the back left boot, if necessary chop off and re terminate these, as the will probably be very corroded.

 

if your pump is still not working start looking at the brown multiplug.. do a search.. and the tacheometric relays (one will do the pump and some other stuff, and one will do the ignition)

 

2) refit the original fuel pressure regulator, these really very rarely go wrong as they are a spring... and when they do you can pull the vacuum take off off and sniff for fuel.

 

3) buy a 12 quid fuel pressure gauge from ebay, some pattern fuel hose (5 quid), some small jubilee clips, and then put this in line before the fuel filter, or after the fuel filter and before the rail, check the pressure at idle and when blipping the throttle to check the fuel pressure, and the vacuum adjustment on the fpr. it will probably be about 40-44psi (have 3.0bar in my head) but someone on here will be able to give the exact figure.

 

then you will know the correct ammount of fuel is getting to the engine.

 

 

What i am saying is diagnose the issue, don't just start randomly rewiring bits and changing parts.

 

Justin

Edited June 15, 2010 by kyepan