Thanks Renny

My car is fitted with european standard, and do not have the catalysator ( not mandatory in 1988). So do not know whta is this O2 sensor, where is it located and yo what it is connected; Could you help and give me theses info.

Thanks csnow,

I have not yet sorted out the pumps ( they are 2), the defect occurs for few seconds only swhen driving, so it is very difficult to check the pumps on a working place.

I suspect also the regulators one inside the distributor ( I have been told) and one outside.

Do you know what to do to measure the fuel pressure while running?
Doing so I expect to be able to see something.