Should fuel pressure stay at 43psi when the motor is turned off - or should it slowly reduce pressure over time? cheers
It will reduce pressure over time. Depending on fuel components and condition, it will alter how long it takes to reduce. It is nothing to worry about.
Doesnt really answer my question though. How much time on average? 10 seconds / 10 minutes / 10 hours? Trying to determine if I have air leaking into the fuel lines. So even an average would be helpful. cheers
Found the answer to my question I have a faulty FPR as its leaking through the vacuum line and the adjustment screw Just wondering now if I can get a kit for it. Anyone know if the sards from china on ebay are genuine or copies?
Full rebuild kit: http://www.ebay.com.au/itm/SARD-Adj...=AU_Car_Parts_Accessories&hash=item20c5ef2961
Pretty much anything on ebay thats new is a non-genuine copy - we get the same on Trademe in NZ Whats wrong with using factory? How modified is your Z? If you really want to go aftermarket, buy something made in Australia, that way you at least know its been made properly - Turbosmart would be one to consider ... http://www.turbosmart.com.au/products/fuel-pressure-regulators
You realise that fuel pressure won't be 43 at idle? So if you are switching your car off, jumping out, running round to your gauge and seeing it read only say 30, that is normal?
What MM is saying is logical - the FPR will return to 43psi, but the fuel in the fuel rail would be at the pressure at the point the engine was turned off, ie, vacuum under idle. Any point between the pump and the FPR could be the cause - most likely would be a leaking injector or the fuel hose that links the fuel rails to the FPR and the FPD - I've never heard an FPR be the cause.
foremanz - Modified enough to run custom fuel maps with nistune sim300 - thats why I figure its an imitation magic mike - I have 43psi idle and 36psi idle respectively - I am getting 0psi after 20 secs and its hard to start obviously - nothing wrong with psi on idle foremanz - normally your right but FPR's can leak internally - this is evident when you have fuel coming out of the vacuum and adjustment screw.
