Lavac Toilet Issues

[TNLI]

We have a Lavac toilet with an electric pump. When I put the smallest bleed valve Lavac do into the inlet pipe I don't get enough suction to flush the toilet, but when I block off the bleed valve, although I now get a decent flush I am also getting siphoning that gradually fills up the bowl till the water reaches the sea level outside, fortunately that is just below the toilet rim!!!

I am at a loss to know what to do. I'm assuming that if I had a manual pump I would be pumping faster than the electric one and thus providing enough suction to overcome the bleed valve. Is the position of the bleed valve important? I have just inserted it at the highest point in the inlet pipework.

Any other suggestions gratefully received.

Read the installation manual again ?? I just used a cheap vented loop and it worked perfectly, but if the inlet is restricted in any way, the hole will suck in more air than required. All marine heads are safer in sea water leak terms if the seat is above the water line. That way there is no real need for a valve that might block one day.

 

[DoubleEnder]

I had a manual Lavac for 17 years. No issues. Check the seals. Check the seat and lid are lined up properly.

 

[Tranona]

This is a 7 year old thread and sure the OP will have sorted it by now