Carb Flooding
Turbo Mini Forums

Morning Peep's

As per title really- After the car was refusing to run once warmed up plus needs no choke from cold and the AFR was reading 10 I trawled through the archives/ search and have done the following:

Checked fuel pressure- still set @ 3.5psi
Return line clear loads of fuel returning to tank
so I then removed dashpot turned on the fuel pump and was met with a fountain of petrol!

So after reading in the archives it sounded like the needle valve was either stuck or had something stuck in it.
I removed the Carb stripped it down cleaned it all nothing obvious stuck in the needle valve???
Checked the float for splits/ holes again nothing obvious- even stuck it in the bottom of a bucket to check for bubbles, nothing.
Re-checked the float height and it was as per spec still.
Reassembled & refitted carb- minus dashpot checked pump no fountain!!!! Yay
Reset jet to roughly the correct position.
started the car with choke warmed up the engine and reset mixture, idle speed etc.
All good. Thought the problem was sorted but 10 minutes later the mixture got richer & richer.
Long story short I'm back to Square 1 with a fountain out the jet!!!

I have ordered a new needle valve kit from Burlen and was going to try just replacing needle valve just in case there is something wrong with it.

But anyone any other ideas/ thoughts/ suggestions?

Incidentally the car did drive perfectly into the garage at the end of the summer no issues what so ever.

if its not been used for a while it sounds seal related ie dried out, cracked maybe you could try a rebuild kit can get them from phil i believe. but im sure the guys with more carb exeriance will give you better info

Done now needs redoing lol

I had a similar issue and it was due to the tank vent being blocked worth a check

Ok, Cheers for the suggestions.
Updated. .... I fitted the new needle valve kit from burlen. No different
So started looking at the fuel pressure reg.
The pressure was fluctuating around 3.5/4 psi but when I switch off ignition pressure slowly drops to 1psi and then stays there for ages????
Would have thought pump off the pressure would drop to zero really quickly? ???
Adjusting the regular has no effect, so do you think the regular is fecked?

are you saying adjusting the reg has no change on your fuel pressure whilst running or on the time it take to get to zero psi when pump off?

Done now needs redoing lol

if fuel is squirting up the jet then the float valve is not sealing correctly and that should be the first thing to sort

Yes i moved to the darkside

Instagram @jdm_brett

You can lap the valve into the seat using some very fine grinding paste, though I doubt this is the problem, it's still worth doing.

Phil.

WWW.TURBO-MINI.COM

http://www.turbominis.co.uk/forums/index.p...tid=469104&fr=0

well since the pump cant flow backwards and the float valve stops it flowing forwards and the regulator stops it returning, it should have no where to go the whole fuel line from the pump through the regulator to the carb should stay pressurised
in fact i used to have issues with the valve sticking shut as mine is the standard float valve bored out and i run about 5/6psi fuel pressure
mines always held its pressure and so did another local members

Edited by Brett on 28th Jan, 2013.

Yes i moved to the darkside

Instagram @jdm_brett

Don't call Benny a member...

(sorry for the hijack)

Okay, is there any way of telling what the culprit is then? fpr or pump?

http://www.turbominis.co.uk/forums/index.p...tid=469104&fr=0

lol andy in the not quite 2 years he had his mini he did/ learnt/ and contributed a hell of alot

even my knackered pump wouldnt flow backwards so doubt that, it could be a weakening fpr but its probably the float valve weeping a little its noting major unless its pouring fuel into the engine

Edited by Brett on 28th Jan, 2013.

Yes i moved to the darkside

Instagram @jdm_brett

The carb float height has been checked and rechecked. The fault is no different with the "old" needle valve or the new one. So like phil says I don't think it is the needle valve at fault??
I took the pressure regulator apart-again nothing obvious.
Reassembled, I tried blowing into the regulator on the pump inlet side and I couldn't so screwed out the adjustor and eventually I could blow though it.
Still getting a petrol fountain out the jet

Going to buy a new diaphragm for the pressure regulator as they seem to be about a tenner.
And maybe a new float? ??

Morning folks,

Just went to order a new diaphram and noticed some Mini specialist list the pressure reugulator as FPR009 and some FPR012
Anyone know what the difference is- higher pressure, both look the same??

Ok well get back to me when you find out what not stopping the fuel from overfilling the float chamber and releaving its self via the jet

Is.your overflow pipe blocked off? Try un blocking that then fuel will come out there instead of the jet

Yes i moved to the darkside

Instagram @jdm_brett

You have yours unblocked then?

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
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I dont have an overflow my carb is built to perfection

Yes i moved to the darkside

Instagram @jdm_brett

On 29th Jan, 2013 Brett said:
I dont have an overflow my carb is built to perfection

Done now needs redoing lol

Brett I understand what you are saying re the needle valve passing but what I couldn't understand is why the fault is the same with the old needle valve and the new one?
float height is correct??
That was why I thought the float is faulty or the pressure reg.
I also don't ever remember the fuel pressure ever being held. i'm 99% once the pump went off the pressure dropped to zero but I could be wrong???
:$
Overflow/ vent pipe is blocked off and yes unblocked fuel pee's out there instead of the jet.

Where are you measuring the pressure?

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

On 29th Jan, 2013 wng691s clubby said:

On 29th Jan, 2013 Brett said:
I dont have an overflow my carb is built to perfection

it needs to be running at a million psi boost lol

Yes i moved to the darkside

Instagram @jdm_brett

I have the gauge T'd into the line going from the fuel pressure regulator to the carb.

Some times its just like this try what turbo phil said it may help there is not a lot it can be the carb itself is so simple there is almost nothing in there

I had this problem my self first turbo engine i built
Edit: because it not obvious from what i said - when i say float valve/ needle i do mean the whole mechanism from the float itself the lever and the valve

I tell you where im getting leaks from the long pivot screw thing that goes through and secures the float, my carb leaks from there on high boost and i cant stop it

Edited by Brett on 29th Jan, 2013.

Yes i moved to the darkside

Instagram @jdm_brett