just a quick question as i am fitting injection to a car that never had it before.
the fuel comes from the tank, to a filter then to the fuel pump. the fuel pump then feeds the fuel to th fuel rail.
from the fuel rail it then feeds an external fuel pressure regulator, the pressure regulator holds back the fuel till it reaches the pressure and releases excess back to the tank.
Hope i have go that bit right.
when the power is removed from the fuel pump is the pressure supposed to dissapear??? (my regulator has a gauge on it)
I was under the impression that the fuel should stay pressurised between the fuel pump and the pressure regulator when switched off?
thanks for your help
fuel pressure
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
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Re: fuel pressure
i am guessing fuel pump then as regulator is new, i suppose i could fit a 1 way valve inline after the fuel pump that way no fuel can find its way back through the pump
Re: fuel pressure
The fuel rail should hold significant pressure until the engine has cooled down to prevent a fire. This is the same reason a car's cooling system is held under pressure to prevent boiling. My 1990 VW has a sensor for temperature above the intake manifold and a sensor for fuel pressure on the rail. They are simple on/off switches that are wired to a couple relays. After the car is turned off: if the temperature is above a certain point and the pressure drops below a certain point, the relays are powered in such a way to turn the pump on.
1990 VW Corrado w/ 2.0 16v - MS2extra, V3.0 board, 2.886 code