B200E Coolant Loss

[foggyjames]

does fuel injection pre-pressurise the fuel rail??

Yes, it certainly does. You can hear the pump whirring with the ignition on, then shutting off when the rail reaches the specified pressure.

I've never encountered a hot starting problem with my 360 - this is purely slow cold starting (after 2+ days, say) from fuel evaporation due to the car standing for a long time. Carbs have a vent as a reference of atmospheric pressure, and I'm guessing that this is where the fuel evaporates to.

I'm certain that plain cardboard won't do the job, as it isn't waterproof.

cheers

James

[340GLT]

Mine does this at the mo, she fires first time on the key then seems to die due to lack of fuel.
Second turn she fires no probs at all!!! I think thats just carbs for ya!!
The jet i changed in mine is the accelaror pump jet located at the top of the car between the two barrels. On the later Weber carbs on the 1.4 the jet is singular and shoots fuel into the choked barrel whereas the earlier jet shoots fuel into both barrels.
Cheers Adam

[shimon340]

Hijames!

I thought fuel injection did pre-presurise hence as you say when you switch on the ignition you can hear the fuel pumps run and then switch off.... however, this post on vvspy in the S40 classic forum under "long engine cranking" seems to imply that a fault with the return valve on the fuel rail means the car has to be cranked for longer for the pressure to rise.... This doesnt make sense if they have electric fuel pumps coz cranking would do nothing! Im thinking the electric pumps are used as the one under the bonnet is low volume high pressure hence mechanical cant do this and the one in the tank is high volume low pressure but has nothing to drive it like a camshaft so it has to be mechanical.

Carb cars that stand will loose fuel from the float chamber. Does your take longer to start after 2 days standing too? Previous 340s seemed to last longer when they stood... actually... they had the earlier type of carb... maybe thats why.........

[340GLT]

It never takes long to start it just seems at the moment once the car has been stood overnight or a coule of hours in cold conditions you need to turn the car over purely to prime the carb if you like. I tried pumping the accelerator instead but that makes no differance to the amount of fuel in the carb you just move it from the float chamber to the barrels!!!!
Cheers Adam

[shimon340]

Hi wouter...

thanks for the info!

- float adjustment
- sealing of the float valve

Im going to have to look into how to check these...


"if the valve does not close properly, air will be able to enter into the petrol hose more easily, this may cause the petrol pump to fall dry (especially if the oneway valves seal less than perfect)
also, when running, the float chamber could overflow, wich is a likely explanation of your other symptoms.

Greetings Wouter"


If the valve doesnt close properly then fuel will keep dribbling into the float chamber evne when its at the "full" point where the needle should close. This might be why its overfills.... good info!!! thanks

If it doesnt close properly...air enters the petrol hose... from where??

peteferrel360...

So after 2 weeks there is no fuel at the pump again.... sounds like my car! I have to prime it manually each time it stands for a long time..... it is ood how fuel seems to evaporate from the pipes so easily... indeed poor seal at the rubber fuel pipe where it meets the fuel pump maybe the cause. If fuel can escape from the fuel lines that run under the car then it can take AGES to reprime the system. this is because fuel pumps are BAD at pumping air!!

will keep you posted... there is also a propshaft to replace and a clutch....

[shimon340]

hi adam

pumping the accelerator only works if there is fuel in the float chamber.. if the chamber is empty due to standing a while then it doesnt help....

However, I've been told the pumping the accelerator trick does help on weber carb if the float chamber is full.... BUT it doesnt work on solexs carbs so thats early 240s and early 340s and 66s.... Anyone with a 360 heard this woth solex's? they have different accelerator systems without an accelerator jet?

anyone got a good manual for tuning solex's? Ive got a 66 with a manically high idle I need to sort for a friend and i have no clue which is the idle screw.......

[antiekeradio]

If it doesnt close properly...air enters the petrol hose... from where??


from the float chamber. it is vented to the outside air through the grey plastic cap.

[shimon340]

dya have a pic of the vent? where abouts is it?

cheers

S

[shimon340]

hello again,

if the float chamber vents to the air and if the float needle is broken so it doesnt close properly this would be a way how the fuel pipe to the from the fuel pump outlet could evaporate and loose the fuel from here right? so basically the broken float needle is why it takes so long to start...

first you have to refill the fuel pipe to the carb and then you need to refill the float chamber.... ie lots of cranking!!!

am i thinking correctly here???

thanks for the info!

how do you test the float needle and how do you set the float?

cheers

Shimon

[foggyjames]

The Solex CISAC on a B200K has a pump jet...as do almost all carbs (in general).

cheers

James