fuel regulator problem/, Maybe fuel pump?? 04/03/11
Turbo Mini Forums

Hi all,
Ive started to do a little to the car , the first was fit new fuel reg. Now its all conected up and i carnt for the life in me get the pressure down. To be completely honest there must be somthing wrong inside the regulator. I did have it in bits to drill and tap to fit my fittings then cleaned it and put back together.

The usuall suspect is fuel return, thats fine and so is the gauge, its brand new and only got used on the old reg.

Im going to ave a better look tomorrow aft but just before i do has anyone else got an idea ive overlooked.

thanks rick

Edited by cossierick on 4th Mar, 2011.

It can only be a few things

Blocked return
Incorrectly connected reg
knackered reg

As the first and second are unlikey and been checked, next thing is to open up the reg I guess. But from your post you've go to this point without my help anyway!!

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

Right ive had a very shit afternoon.

Got the reg apart and it looks like the return is getting blocked.

Ive tapped the return hole and in turn its made it larger so the adjustable valve is going in too far and getting stuck. Bastard

So ive tryed to put a bigger o ring on but im not sure if its helped.

I pulled the plugs out and turnd the motor over as they were soaking and it must of fired a galon of fuel out.


Ive connected it all back up and tryed to set the pressure again and it seamed ok but when ive connected it to the carb it ended up pissing fuel out of the anti run on valve thats usually blocked. I pritty sure that isnt suposed to happen , so im now thinking its bust somthing in the carb.
And to top it off the new starter keeps locking up.

Sorry, not really sure if you guys can help but needed to have a rant.

rick

If your fuel pressue is higher than the needle valve can withstand then fuel will piss out of the anti-run-on valve vent, that's normal.

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

Rick do you want to borrow mine to fault find?

i can chuck it in the post and you can send it back when you are done

Thanks neil but it wouldnt fit without a lot of messing .
All these fancy fittings are making it a pain, wish id just stuck to the good old way.lol

Rick Thanks again.

ps, chears wil, i wont strip the carb just yet then.

Maybe a duff float valve will drop the pressure in regulator to carb line enough to mess with the regulator setting? How about blocking that line to measure the pressure with no fuel going to the engine?

what kind of regulator? ,most wont go low enough to supply a carb..

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

Dennis its the propper rising rate from mini spares.

Its brand new, Ive had the gauge in the end of the fuel line that goes to the carb to set it anyway.

Right its getting the better of me.

Ive checked the return for blockages, made sure ive got the pipes on correct etc , but im hoping ive found the problem im just not sure how to solve it.

Right, ive drilled and tapped the holes that had the brass pipes in, now the return is the problem, ive got pic's to try and show what i mean.





Ive put a pic of the new and old diaphram and the old one seams to have a bit of extra lengh just past the o ring.! It seams now the return hole is bigger (with tapping it) the brass part of the diaphram is getting stuck in the hole. Ive tryed to put a bigget o ring on but it just pushes it off as the cut out isnt big enough to hold it in.

All it seams to be doing is fludding the motor with fuel, now i mean fludding, the motor is locking up as the bore's full of fuel, it even filled the plenum up aswell.

can anyone think of a way around it. My last option is getting another reg and leaving the normal fitting on but id like to sort it with my fancy ones.

Thanks in advance gents.

Just to show its still here just got more dust on.lol

rick

s##t i will have to look at my one now before it gos on the car as its tapped out to.

I have started posting on Instagram also my name on there is turbomk1golf

Nothing is impossible it just costs more and takes longer.

love the paint job on your car.. looks good.

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

That doesnt make sense.

You are saying the return is the problem because you drilled it out ?

But the return isnt actually working, it's blocked somehow ? Otherwise how else would fuel pressure be too high and flooding the carb ?

If you damaged the seat so much that it would never seal, then the only issue you may have, is never being able to get enough pressure.

So which is it. Too much fuel pressure, or not enough ?

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Well you can't change the diaphram. So the only way is to block it up again and re drill it smaller I guess. Not sure 100% on exactly how.

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

Sorry gents im not explaing it very wel.
The brass part that obviously sits on top of the return hole is now going further down thehole due to it being larger! Thus blocking it and making it all go to the carb.
Im just trying to work out how it acctual works anyway. Im thinking the o ring sits on top of the hole and the tayperd bit allows fuel through the return?? but what i carnt grasp is most people use an injection pump like me and theres nothing blocking the carb outlet so surely more would go through there anyway.
Now obviously it does work like that.

Am i making sence or just confusing myself. Its easyer to show somone.lol

rick

It's dead simple. As the boost rises it blocks the return. As less fuel is allowd to return, the the pressure to the carb increases.

I would say the tapered bit is purely for allignment. even at maximum boost I doubt it ever fully closes on most cars.

If it's getting stuck in the hole you may get away with relieving it so it dosen't get stuck. This is on the assumption that it will never need to fully close.

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

There is no way with an efi pump it would ever fully close.
Most efi pumps will supply more fuel than any A-series will ever need, and then some.

So what fuel pressure are you actually seeing ?
If you take the adjusting screw out, what pressure are you seeing ?

I guess if you have somehow created a hole, where the o-ring can actually get stuck in it, that must be the problem.

either drill it out larger and sleeve it back down again, or buy a new FPR and dont drill all the way through for tapping.

In fact, surely you could nearly have run a tap into the hole without even drilling ?

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Its broke the gauge so waiting for a new one. I dont fancy getting another new one so il have a mess and see what i can sort.

rick

thanks gents

I had a the same problem . the fuel pipes I was using were too big.
Darren

http://s256.photobucket.com/albums/hh167/boz-reb-2303/
http://s609.photobucket.com/albums/tt176/boz-reb/

1971 turbo mini van
1978 clubman estate
1971 clubman

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Sorry for not explaining myself , I first used copper pipe that was 10mm external and 8mm internal. Thats when I was having problems with the high fuel pressure.
I changed it to another copper pipe that was 6mm external and 4.5mm. that brought the pressure down. Darren

http://s256.photobucket.com/albums/hh167/boz-reb-2303/
http://s609.photobucket.com/albums/tt176/boz-reb/

1971 turbo mini van
1978 clubman estate
1971 clubman

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Right gents ,im getting nowhere with this.

Ive got yet another reg (from wolfie in working order) and its still firing fuel thru.

Ive completly got rid of the return so the reg return goes straight into a cup. Unscrewed the adjuster completly and its still flying through.

Could the pump be too powerfull. Il try and dig details out on what it is, i no its a sytec.

The car did run but the old reg was leaking so now its not with the new reg , can it just not cope with the pressure.

rick

what pump you running rick?

I will check exactly but im sure this is wot i orderd, its that long ago now.lol

http://www.fuelpumpsonline.co.uk/rover-met...pump-1618-p.asp

rick