Pulsation Dampener. (it evens out the fuel pulses from the pump, it does
Pulsation Dampener. (it evens out the fuel pulses from the pump, it does NOT impedeNOT impede fuel delivery, or power output (to a point), once your making 300kw's+ you might as fuel delivery, or power output (to a point), once your making 300kw's+ you might as well ditch this thing.
well ditch this thing.
How you set your fuel system up is pretty much up to you. Bear in mind that two pumps How you set your fuel system up is pretty much up to you. Bear in mind that two pumps get pretty noisy in a hatchback. Not to bad in a coupe with a back s
get pretty noisy in a hatchback. Not to bad in a coupe with a back s eat and some sort of eat and some sort of barrier to the noise. Under the car is good place for them, but they are open to the
barrier to the noise. Under the car is good place for them, but they are open to the elements there. Be realistic, if it's a stock engine, all you need
elements there. Be realistic, if it's a stock engine, all you need is a decent EFI pump andis a decent EFI pump and you do not need a rising rate reg, and a surge tank, it all costs money, it's more things you do not need a rising rate reg, and a surge tank, it all costs money, it's more things to fail and go wrong, keep it simple: the stock system works well, try it for a while then to fail and go wrong, keep it simple: the stock system works well, try it for a while then make changes.
make changes.
Below we have an image from the megasquirt site which shows the basic fuel system. Below we have an image from the megasquirt site which shows the basic fuel system. This image shows how the EFI fuel system is set u
This image shows how the EFI fuel system is set u p. It's simplistic, but it is veryp. It's simplistic, but it is very important to understand this.
This is the model for a surge tank set up, not
This is the model for a surge tank set up, not e the use of a low pressure the use of a low pressure fuel pump one fuel pump on the surge tank.
If you use a high pressure 'lift pump' then the fuel will hit the surge tank, find it to be If you use a high pressure 'lift pump' then the fuel will hit the surge tank, find it to be full from the high volume lift pump, and back pressure will form behind the main pump, full from the high volume lift pump, and back pressure will form behind the main pump, this pressure will then flow back into the fuel
this pressure will then flow back into the fuel tank via the surge tank's relief line.tank via the surge tank's relief line.
Pumps (high volume ones like Bosch 44's) move alot of fuel, so heat will start to soak Pumps (high volume ones like Bosch 44's) move alot of fuel, so heat will start to soak into the fuel from the pressure and then into the tank. Once the tank starts heating up into the fuel from the pressure and then into the tank. Once the tank starts heating up the heat just keeps getting higher and higher. Expanded fuel is less dense. Hot fuel is the heat just keeps getting higher and higher. Expanded fuel is less dense. Hot fuel is dangerous.
dangerous.
I made this mistake myself, the heat in the fuel lines and surge tank was clearly I made this mistake myself, the heat in the fuel lines and surge tank was clearly obvious; the hot fuel tank scared the shit out of me, I shut the system down obvious; the hot fuel tank scared the shit out of me, I shut the system down immediately and disconnected the power. It was a big mistake to make, and it's not immediately and disconnected the power. It was a big mistake to make, and it's not something a fuel cooler will solve either.
something a fuel cooler will solve either.
There is where the injector resistor goes, if your replacing the 1uz-fe injectors with There is where the injector resistor goes, if your replacing the 1uz-fe injectors with bigger ones (assuming), that are low impedance; you have no need for resistors if you bigger ones (assuming), that are low impedance; you have no need for resistors if you set up is stock factory.
set up is stock factory.
If your injectors are playing up, or the engine doesn’t seem to firing on all cylinders If your injectors are playing up, or the engine doesn’t seem to firing on all cylinders there are solutions. It's very common for fuel deposits to cause the injector gate to lock there are solutions. It's very common for fuel deposits to cause the injector gate to lock up. Sometimes all it takes it to keep rev'ing the motor. Other times you have to tap the up. Sometimes all it takes it to keep rev'ing the motor. Other times you have to tap the injectors while rev'ing the motor. If the injector(s) are really locked up you need to injectors while rev'ing the motor. If the injector(s) are really locked up you need to remove them, take the rubber seat off the bottom, and soak them in fuel for a day, then remove them, take the rubber seat off the bottom, and soak them in fuel for a day, then try tapping while switching them on/off (two person job).
try tapping while switching them on/off (two person job).
If your really sure an injector is playing up, here's a tip from the Toyota manual for If your really sure an injector is playing up, here's a tip from the Toyota manual for someone with some serious electrical gear floating around.