yes an other fueling problem
Turbo Mini Forums

Hi,

engine starts at ones but when the pumps starts i must rev it to keep it going. It smokes a lot. If i disconnect the + of the pump it runs normal in a couple of seconds until the carb is empty or i connect the + again and it builds up the pressure ones again.

I use a SPI tank with a SPI pump through a rising rate fuelregulator. I screwed the bolt the whole way out on top of the regulator.I have set the float in the carb so that when you have the carb upside down the lowest point of the float is level with the carbbody(found this somewhere on this site).

I was told that the pump was to strong, it's a injectionpump on a carb engine. So today i splitted the feed and return and made a bypase so the fuel could go around before it even reaches the regulator. I made this right after the tank.

It still does not run idle with out the use of the right foot

I need to check the presure of the fuel to the carb, but i don't have a meter to check it. I'm tring to find one for a reasonble price.

What i want to know is: more people use the SPI pump, did they do more modification to get it working?

there is nothing wrong with a A-series that a turbo can't fix.

www.turbomini.nl

you should not use a rising rate reg with a carb, you need a fixed rate regulator like the standard metro turbo item.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

the pump isnt an issue. Choice of FPR is.

As is the needle valve sealing correctly.

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

I starting to think if i said the right thing about the regulator.

The one i have is here on page 35.

http://www.fuelsystem.co.uk/Malpassi%20Fue...0Regulators.pdf

i now even read that it should reduce the presure from the pump to the carb.

carb is rebuild and the needle valve closed perfectly.

there is nothing wrong with a A-series that a turbo can't fix.

www.turbomini.nl

FPR012 would be suitable,m although the term "rising rate" can be misleading and confusing.

But that is the correct "boost referenced" regulator.

If the engine is stalling due to flooding, then the needle valve is not closed perfectly.

What fuel pressure do you have ? And what pressure have you tested the needle valve too to ensure it will seal ?

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

FPR09/012 it's the one i have.
At the moment i don't know what the pressure is. I don't have a meter to check it, yet

When i put the carb back together i blew as hard as i could and it did not leak any air. When i lifted the float is started to let some air pass. I don't know for sure if this was the correct way to check it but it is the only way i could think off

there is nothing wrong with a A-series that a turbo can't fix.

www.turbomini.nl

I think you need to get the fuel pressure set at the regulator. If it's too high it will just overwhelm the float valve.

One thing i'm not sure about is the fine red writing at the bottom of the page.

It says that the regulator reduces the pressure from 60 psi to 5 psi. But i belief that we want 3-4 psi. What will the effect be for that one psi to much

there is nothing wrong with a A-series that a turbo can't fix.

www.turbomini.nl

5psi might be ok, but without a gauge in there to measure the fuel pressure, you could have it set much higher.

In the 13's at last!.. Just

In my experience so long as it is not being forced passed the needle valve it is fine. Setting the FPR pressure to 3/4psi is not critical, but it does have to be at least 3/4psi. I have successfully set the pressure with this (perhaps bodgy way)

Remove the dash pot. Slowly increase the pressure until it passes the valve and squirts through the jet. Now back off the pressure until it stops and that is about right. This only works though if you have a known good float valve and the fueling is well set up. If not I would recommend a fuel pressure gauge.

I know the risks involved in this but if somebody wants to point them out that is fine.

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On 31st Oct, 2010 paneermeel said:
FPR09/012 it's the one i have.
At the moment i don't know what the pressure is. I don't have a meter to check it, yet

When i put the carb back together i blew as hard as i could and it did not leak any air. When i lifted the float is started to let some air pass. I don't know for sure if this was the correct way to check it but it is the only way i could think off

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

I did some checks i can do without a meter

- i took the dashpot off and screwed the screw on top of the regulator in, i did not see any fuel coming(?).

- i took the fuel feed of the carb to see if the carb is getting it's fuel and yes it flows nicely.

- i attached a other hose to the carb so it would be gravity fed and started the engine. The problems are the same. At first a lot of stutter and when the first part of petrol has gone it starts to run more smootly.

So i think the problem is in the carb

I looked ones again on how to set the floatheight and the hollowpart should be 1 mm lower then the carb facings. I set it perfectly level. But the problem goes away when the level of petrol is getting lower and if i set it according the rebuild guide it is getting higher.

And if the needlevalve is not closing properly i would expect some fuel when i remove the dashpot out of the carb.

I will try to get a meter tomorrow to see what the pressures where talking about.

there is nothing wrong with a A-series that a turbo can't fix.

www.turbomini.nl

there is nothing wrong with a A-series that a turbo can't fix.

www.turbomini.nl

Does the piston move up and down freely in the dashpot chamber ?

And float height doesnt seem to have a massive impact on running.

More likely it's either a spring, oil or simple mixture setting ( needle/jet height ) issue then

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

there is nothing wrong with a A-series that a turbo can't fix.

www.turbomini.nl

next to the fuelfeed is a pipe you should block off. I removed the plug and started the pump. Fuel flowed out of it? I don't know if this is normal?
I'm hoping this could help to get to a solution.

number 4....

there is nothing wrong with a A-series that a turbo can't fix.

www.turbomini.nl

there is nothing wrong with a A-series that a turbo can't fix.

www.turbomini.nl

ok,
i changed the float needle with one from a other carb and now the anti run on valve stays dry, no more fuel coming out of there.

But the problem is still there

there is nothing wrong with a A-series that a turbo can't fix.

www.turbomini.nl

So...explain very clearly what the problem is.

All I have picked up so far, is that it doesnt idle ?

Which could be very very easy to fix.

Have you adjusted the mixture screw ?
Does the choke work ?

Has someone competent looked at the car ? ie with an ability to diagnose problems ?

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

there is nothing wrong with a A-series that a turbo can't fix.

www.turbomini.nl

YIP YIP HOERA it run's.

I removed the chokepart and when i pulled it out of the carb i saw that a O-ring was broken. I replaced it with a other one and tada now it runs with the pump on

It still is not running 100% but that can be sorted with a dynosession.

Thanx for the help and advice.

there is nothing wrong with a A-series that a turbo can't fix.

www.turbomini.nl