ummm bit stuck here!
Turbo Mini Forums

Hello everyone, i now have my engine installeed and turning over unfortunately thats all the the little bugger will do ! ive set the timing had running on a bench. ive checked for a good spark- no probs , but i think it could be the float valve as petrol pours out the mouth of the carb when it stops turning over or is this because the petrol is not being burnt? just looks like alot of petrol considering its just turning over p.s suck through supercharger vmax kit always have a bit of petrol after run but this is major, its almost like i have just pulled a petrol hose off!! any ideas? i checked the float level and its spot on, it almost started but then nothing ! dried the plugs tried again then nothing again. the car has been sitting so guessing battery could be slightly flat and being a new engine could be using more power to turn it over?

If petrol comes out under fuel pump alone, then your float valve is not functioning correctly, OR you have too much fuel pressure.

BTW - if any sizable amount of fuel got into the bores, then you might want to drain off your oil and replace this.

ah so could be my regulator then?

sorry forgot to mention that the fuel only starts pouring out when i stop turning the engine over .

sound to me like it is pissing fuel in and is being forced into the engine by the charger, when you stop turning it over the charger stops sucking it in.

what fuel pump do you have?

pull the carb off take the bottom off and check the float assy,

change the oil.

pull the plugs outpoke a pipe in and suck to see if there is any fuel puddled in there, if there is it may be worth a couple of squirts of oil in to the bores.

Cheers for the suggestions guys, yeah i pulled the plugs out and there was petrol pudddling on the pistons , i might disconnect the pump its a solid state silver top , i figure the engine will start up and idle with the petrol in the float chamber and then reconnect the pump once its running to see what happens hopefully itll run ok! ive never been convinced with those pumps that continually pump last time i cheecked the regulator it was running at 4psi at idle is that bout right?

4 psi is the quoted metro turbo figure,

if your usin it as suck thru it wouldn't hurt to knock it back to three, pretty sure thats what std su pumps make.

deffiniatly sounds like its the float valve though, it could just be crap in it or it could be worn or mis adjusted. if its pissing that much throu thou i reckon is crap in it.

if ypu have an airline give it a blast of air to see if that clears it and then let the pipe runn into a milk bottle to check for crap.

"A milk bottle" lol

Now theres something I have not seen for many a year!!

website:- http://www.terryhunt.co.uk

UPDATE- wasnt sure whether or not i was adjusting float correctly so took the carb down to vmax and stu confirmed it was fine , but while he had the carb he changed valve and float gasket , took it home hoping it was that . ......... it wasnt:( running out of ideas now . ive got an inline fuel guage coming today so will bew trying that next . any other thoughts anyone??!!

anyone had any similar probs i mean can a regulator go wrong? even though the last time i used it it was fine

would it be worth winding the fpr right out so it is effectively just on pump pressure?

goofed up

Edited by miniminor63 on 4th Jul, 2008.

???

'Just' pump pressure is quite a bit more than 4psi.

In the 13's at last!.. Just

um thats what i thought . swap regulator?

Get a fuel pressure gauge on it, that will tell you everything you need to know. :)

cheers for the replies guys. just hyperthetically though if the pressure is ok what is the next thing i should look at ? apart from burning the bloody thing!

well, id cross that bridge when you come to it, if the carbs ok, its highly likely too much fuel pressure, there isnt really many more things it could be?

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

Right quick update ive managed to get a reading after fpr and its 3psi with the engine turning over . is that about right ? and if so what is going on then?Should the pressure on the guage rise if i screw the regulator valve clockwise or would it only rise when the engine is revving because when i turning the screw the screw it was having no bearing on the pressure.:(

If you take the dash pot off and turn the fuel pump on, does fuel come out of the jet?

If this is happening at 3psi then the float valve isn't working. Set properly in good condition, they'll easily hold off 5psi. I know you've had it looked at but is sounds wierd.

I assume you have the reg connected up properly? any piccies?

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

I just cant fathom why it runs perfectly without the pump turned on but as soon as i do it bogs down and dies after about 5 secs, i tell u what i have noticed though the overflow doesnt overflow or should it only overflow from the bowl? yes the reg is fine havnt taken it off since it was running b4. when it was being run up it was set up on a mech fuel pump and it ran spot on .

Would choke seals be the culprit i havnt stripped the whole carb down yet

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

so can anyone suggest anything else not a strong enough spark so when the pump is running they get overwhelmed ? just a suggestion,clutching at straws to be honest.