Water pressures varies from high to low. Not idling right

To some extent the fuel pressure will vary depending on the depression inside the intake manifold. The fuel pressure regulator is set to produce a small range of pressures. At high manifold depression the lower pressure will be available and at low depression (throttle wide open) the fuel pressure will be at the highest.

This is the way the fuel/air mixture is richened so the engine will accelerate smoothly.

PO961Is Pressure Control Solenoid A Control CKT Range/Perf.

Most likely your sensor is too sensitive and detects the low oil pressure that exists in idle .... you oil pump is not functioning fully and at idle fails to produce the right pressure. Lastly,your idle could be set too low. try increasing the idle slightly (you don't want it too high) and see if that solves the flickering light problem

Low oil pressure at idle can be caused by an engine with worn rod or main bearings due to (usually) high mileage . This however does not mean the engine is still not serviceable as long as the oil pressure is low only at idle. The pressure should at minimum get into the normal range at anything above idle speed.Not much oil pressure is really necessary at LOW speed. At low speed, as long as there is oil getting to the bearings, even at low pressure, you are OK. In a high mileage engine the oil pressure is often low at idle simply because the oil pump is turning slowly and cannot maintain higher pressure between the larger than normal crankshaft and bearing clearances. As speed increases the pump turns faster and supplies more oil and the pressure should go higher. Low pressure as long as it is only at idle is not a problem. However at higher speeds the pressure should be in the normal range. Such a worn engine can benefit from higher viscosity (thicker) oil such as 20W-50 in above freezing weather and 10W-40 in winter. That will increase idle pressure and the thicker oil film maintains a better film between the worn parts

low side should be about 30 psi at idle speed, high side 120 to 180 psi depending on ambient temp. higher temp, = higher pressure, as you increase engine rpm to say 1000 low side should drop to 10 to 15 psi & high side should increase about 30 psi. If high side goes over 280- 300psi you have contamination (air) in system or over charged with refrigerant. you will need to recover freon, evacuate & recharge system with proper amount of refrigerant. If the low side drops below 0psi or into vacuum then the refrigerant level is low, you will have to check for leaks , repair leaks & refill refrigerant.
Hope this helps
Paul T

sounds like the air filter may be blocked or the carb has a dirty jet in it

try idle screw adjust so motor dosnt labour

Bleed the system by running water without the unit on, You have an air lock, open the drain cocks and allow water to run slowly for 2 minutes, then close everything and try it

Sustion or low pressure depending on indoor temp about 70-75 head pressure will vary with a,bient temp. But no moe than 260 to 275. Rus

Had same problem. Turned out that antifreeze was low causing insufficient water pressure. Could also be a bad sensor. I would check both.