roll over valve, cannister and wiper pump

[timshap]

Having read some earlier and interesting posts on the subject of purge valves etc..I have had for some time a vacuum in the tank when releasng the filler cap.
Is the valve situated behind the tank and could that be blocked or the canister not breathing effectively.
just wondering how to test the can etc..

I have just recieved my new wiper motor from Adian who was extremely helpful and all fits and works well. I wanted to see if the water check valve was there or indeed working as it seems to take a while to get water on the windscreen. Having checked around the water tank in the lower offside bowels I can only see the filler and a clearish pipe heading up into the offside wing i guess towards the brake fluid resovoir and then it runs above the steering column under the dash before heading out to the windscreen front valance.

I just wonder where the pump might be situated and indeed the one way valve. I was thinking of cutting the pipe 10 cm out of the tank and fitting a new one in that postion. Is that sensible?

Thanks

[saml666]

My roll over valve was corroded to hell (I only found it though as I had the tank out for a body-off refurb) ... I am replacing it with s plastic ford alternative and ditching the carbon canister etc. Part number 91 AB-9A 153-AA BZ 02 A about GBP30 from my local garage

Cheers,
Sam

[PRTVR]

timshap said:

I have just recieved my new wiper motor from Adian who was extremely helpful and all fits and works well. I wanted to see if the water check valve was there or indeed working as it seems to take a while to get water on the windscreen. Having checked around the water tank in the lower offside bowels I can only see the filler and a clearish pipe heading up into the offside wing i guess towards the brake fluid resovoir and then it runs above the steering column under the dash before heading out to the windscreen front valance.

I just wonder where the pump might be situated and indeed the one way valve. I was thinking of cutting the pipe 10 cm out of the tank and fitting a new one in that postion. Is that sensible?


Thanks

Hi Tim, The pump for the screen wash is located at the bottom of the tank as in this picture,
http://cgi.ebay.co.uk/TVR-Cerbera-Chimaera-Griffit...
on mine the hose runs from the pump and heads into the space behind the indicator, where there is a connection (push fit)you can just get to it using the vent holes, if I remember yours is
pre face-lift so you may have to remove the grill to get access,strange but mine has the same problem it still works but takes a time to get the water through, I was thinking that the hose may have a small hole somewhere or a push fit connection pushed slightly off,caused by the very cold weather we had over the winter, but with the path of the hose its not easy to check.

Phil

[timshap]

Thanks Phil

I now realise that the pump sits underneath the water bottle and reckon I will position the valve some 9 inches off the bottom, hoping it will hold the water up to the wipers.
Having not had the front grill off for some time most of the supports for the oil cooler and bits need a clean up and de rust etc..I will later take the tank out and check the roll over valve which may well be blocked / siezed. Its a Jan 94 500 and have for some time had odd knocking sounds from the tank indicating a loose guage float or baffle problem ..even worse!!

Tim

[timshap]

Sam

I believe I have traced the problem back to the roll over valve which on mine is situated about 1/3 the way down behind the tank on the filler side. Having diconnected the line to the can have tried forcing air from both directions and nothing moving at all...I used the air pressure from the tyres via an easy bleed system to force air down but believe its solid.

I notice on demon tweeks that you can get in line vent valves which allow air in both directions but stop fuel going down in the event of being upturned etc !

The ford part you mention...from which vehicle is this from..I will have to order from the factory and wonderd if there were other types I could get from other manufactures. My carbon can (big round one) was originaly rochester PA66 now AC delco for GM i think and cant find anyone who does these still??

Any clues?

The final bits to what has been a complete birthday (for me anyway) to the '94 500.

[SILICONE KID]

Im suprised know one has had the balls to fit a flush fitting filler cap on the out side of the car..this means no carbon canister needed..The carbon canister is only fitted because the filler cap is in the boot so its not allowed to vent..

Edited by SILICONE KID on Wednesday 27th April 00:04

[Ribol]

SILICONE KID said:

..The carbon canister is only fitted because the filler cap is in the boot so its not allowed to vent..

Is it?

[Pink_Floyd]

timshap said:

Having diconnected the line to the can have tried forcing air from both directions and nothing moving at all.

Tried this on mine, air flows freely one way but not the other. I can blow air freely from the canister into the tank.

[Simon says]

Ribol said:

SILICONE KID said:

..The carbon canister is only fitted because the filler cap is in the boot so its not allowed to vent..

Is it?

Daz,what the f*ck are you on about your not even close think about the environment and emissions etc and you may get warm I am sure Spend or someone on here mentioned the purge valve and canister is from a Rover but could be wrong

[Ribol]

Simon says said:

Ribol said:

SILICONE KID said:

..The carbon canister is only fitted because the filler cap is in the boot so its not allowed to vent..

Is it?

Daz,what the f*ck are you on about your not even close think about the environment and emissions etc and you may get warm I am sure Spend or someone on here mentioned the purge valve and canister is from a Rover but could be wrong

Even if we weren't trying to save the planet there is the small matter of the boot seal leaving the filler cap open to the elements as it is on any other car with a filler flap anyway

[SILICONE KID]

You don`t have to be rude! Most cars do not have a carbon canister i would say TVR fitted it partly due to the filler cap being in the boot ..Thats it..

[CarlosV8]

Simon says said:

az,what the f*ck are you on about your not even close think about the environment and emissions etc and you may get warm I am sure Spend or someone on here mentioned the purge valve and canister is from a Rover but could be wrong

When I queried about the carbon canister someone mentioned a rover 200, so I found a cheap new one for ten quid and I'm gonna try and fit it at some point. Certainly looks the same on the face of it, so hopefully it'll be ok. I'll report back when I get round to it

[SILICONE KID]

How does the carbon canister fail,thought it was just a filter absorbing the vapours..

[Ribol]

SILICONE KID said:

..........due to the filler cap being in the boot ..Thats it..

Is it?

Or is the filler cap under the boot lid with a seal that leaves the boot sealed and the filler cap open to the elements?

Honest question - as a "Gas Safe" plumber do you not understand this?

[SILICONE KID]

Yes i understand the filler cap is sealed beacause its not allowed to breath ,The boot would fill up with vapours..tt..If the filler had been fitted on the body work there would be no problem..

[Ribol]

SILICONE KID said:

Yes i understand the filler cap is sealed beacause its not allowed to breath ,The boot would fill up with vapours..tt..If the filler had been fitted on the body work there would be no problem..

Then your boot/filler/seal arrangement must be different to mine - I really hope that is the case.

[Simon says]

SILICONE KID said:

Yes i understand the filler cap is sealed beacause its not allowed to breath ,The boot would fill up with vapours..tt..If the filler had been fitted on the body work there would be no problem..

Its still not allowed to breath at this point as you are not allowed to vent to atmosphere(apart from filling up obviously) and for your information Daz most petrol driven cars are using evaporative carbon canisters now and the japs have been using them since the late seventies