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Hi Paul, I cannot think of anything which would have interfered with the fuel line while fitting the caliper or pads. The fuel filter is fitted in the engine compartment against the firewall fairly low down. You may like to check and possibly replace it as sometimes the connections do leak. The other areas of concern are the seals fitted to the top and bottom of each injector, the feed connection into the fuel rail, and the return pipe to the tank. Make an inspection of all flexible pipes and joints, taking special note of all banjo bolt connections, making sure that all gasket washers are sealing correctly all the way to the tank. Regards John
The toyota previa uses a formed silicone gasket for the valve cover and the cover is held in place by metric shoulder bolts ( 10mm). The valve gasket leaks because you can't get enough preload on the bolts to re-seat the old gasket when it gets old and shrinks. The shoulder bolts only allow you to tighten the gasket enough to seat the shoulder on the bolt. If you continue to torque down the suspected bolts, you will snap the bolt off ( don't ask me how I know this ). You can either 1.)replace the old gasket with a new one or 2.) remove the existing bolts around the leak area and put in new metric bolts that do not have a shoulder. You may want to put in a small sleeve into the existing bolt hole but shorter than the thickness of the valve cover to account for the smaller diameter bolt. You can now torque down the bolt and get enough preload to seal the valve cover without removing the old gasket. Make sure you use a torque wrench ( in-lbs) or be very careful not to snap these small valve cover bolts.
Possible air leak take off engine covers and spray with wd40 whilst engine is running if idle increases and engine becomes less erractic then air leak is were you sprayed wd40 normally its a gasket gone