2005 Mazda 3 with the 2.3L & MTX. 150kmi. Return less fuel system.
Checking fuel pressure today in order to investigate a long crank issue. I was thinking rest pressure problem. Hooked up fuel rail adapter and pressure gauge and went KOEO. Fuel pump kicked on and went off. Pressure gauge showed zero psi. I tried it several times, key on, pump runs but no subsequent pressure increase. Gauge just shows zero till you start the engine.
KOER and pressure went to 54psi, in spec. Bleed off was rapid but I'm checking to see what the spec is. After 30 minutes it was around 23psi and still dropping.
Anyway, my question is, With a return less system will there be a pump prime every single time you turn the key on and the pump runs?
I have Paul's book and on page 16-2 he says that not all return less systems provide a prime. However, I hear the pump running after every key on, so, I'm a bit confused.
Thanks for the help!
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