I have done this couple of years back, it been quite some time so I may not be accurate but roughly I will tell you what is needed here. First, fuel pressure gauge was not available anywhere even with Toyota dealership then I came up with an idea, I went to an air conditioning spare parts shop and purchased Air conditioning pressure gauge, I connected one side with a plastic pipe similar to the one used for connecting home gas heaters with gas lines. I had the pipe clipped with its clipper so that it does not come off. I disconnected the other end of the fuel line at engine bay and had connected it with other ends of that plastic pipe and now my fuel pressure gauge was ready.
Test says that you have to crank the engine one or two times in order to pressurize the fuel line and your gauge will now show some pressure, if I am not wrong it should be 45psi. test says, that this pressure should not drop to 80% of its original value within the first 6 min. if it stays roughly at 38 psi on 6th min then your pump, fuel pressure regulator is fine and if it drops then the issue is somewhere
inside fuel unit inside fuel tank.
I donât know what made you change your fuel filter earlier and if you did not had this issue before you changed the fuel filter then I am willing to bet that your fuel regulator, fuel pump and fuel filter is fine. Your fuel sending unit inside your tank consist of fuel pump, fuel regulator and fuel filter. These are fitted with O rings of few different sizes. Most of the times, once mechanic changes the fuel filter then he forgets to put back the o rings or o rings at times gets damaged or at times he does not properly places the o ring into its place and what happens is that your fuel starts to get leaked inside the fuel tank after its been pressurized resulting in sudden pressure drop and your fuel pump now has to
work harder.
People here have very poor diagnostic skills, once you fall for such thing then it means you have fallen into unbreakable cycle of ripoff but if you are able to understand the issue then you can also tackle the issue so important thing is to understand your issue properly. I would not advise you to visit the Toyota dealership as those idiots are ripoffâs with very bad diagnostic skills and they will make you change each and every part. In the worst case scenario, visit SULTAN KAH KHAO and buy the whole unit for somewhat 2-3 thousand rupees.
But you donât even need to do that, first perform the diagnostic as I have told you, you are lucky as you know that this issue is inside fuel tank and you need to reverify that, people at times waste fortune in-order to find that. If your fuel pressure rises to 45psi then that means you pump is fine, if it drops below to 38 psi within first 6 minutes then you know the issue is with some o ring inside as fuel pressure regulator does not goes bad so easily and at worst, you can buy a second hand for roughly 100 to 200 Rs from scrap yard market and it works pretty well. take charge, work with electrician and mechanic, guide him along as he works or if you have little knack for DIY then do it your self.
