first time start up preperation?

[SmbFD3S]

if you turn the key two clicks the fuel pump will prime the whole system.

No, the fuel pump doesn\'t prime/start as standard until you are cranking the engine....

[karl_tate]

No, the fuel pump doesn\'t prime/start as standard until you are cranking the engine....

im not trying to argue with you but you are wrong im affraid.

if you put a gauge in line and turn the key to position two then you will see that you have pressure meaning it has primed the system. when you turn the key right round (ie to start the car) all that is doing is turning the starter motor and as soon as you let the key go it goes to position two again. fuel pump and ignition.

how else is the fuel pump going to keep running if it only works when cranking.

[SmbFD3S]

im not trying to argue with you but you are wrong im affraid.
 
if you put a gauge in line and turn the key to position two then you will see that you have pressure meaning it has primed the system. when you turn the key right round (ie to start the car) all that is doing is turning the starter motor and as soon as you let the key go it goes to position two again. fuel pump and ignition.
 
how else is the fuel pump going to keep running if it only works when cranking.

I dont wish to argue either but i am 100% correct, have you tried this then?
 
The fuel pump is controlled via the ECU which opens a circuit relay which in turn opens a fuel pump relay depending on the load on the engine via a throttle position sensor. Depending on the throttle position sensor, engine rev\'s etc the fuel pump will either be fed by a voltage through the fuel pump resistor or direct battery voltage. Since there is no engine load, rev\'s or/and the throttle position is closed the fuel pump will be off....  This is why there is the facility to jump the connections in the diagnostics port...

[karl_tate]

ok well i carnt comment on that as i dont know anything about ecu\'s etc lol

well i have an aftermarket fpr with a gauge and when i turn the ignition on the fuel pump primes and can see the gauge go up and also hear the pump whine and then stop when the correct pressure is reached.

this has been the same with all the other cars i have owned and worked on but i know the FD is complicated to say the least.

[Timrxmotors]

I dont wish to argue either but i am 100% correct, have you tried this then?
 
The fuel pump is controlled via the ECU which opens a circuit relay which in turn opens a fuel pump relay depending on the load on the engine via a throttle position sensor. Depending on the throttle position sensor, engine rev\'s etc the fuel pump will either be fed by a voltage through the fuel pump resistor or direct battery voltage. Since there is no engine load, rev\'s or/and the throttle position is closed the fuel pump will be off....  This is why there is the facility to jump the connections in the diagnostics port...

100% wrong!!!  Fuel pump runs when ignition is turned on,for a few secs to prime system.

[karl_tate]

100% wrong!!!  Fuel pump runs when ignition is turned on,for a few secs to prime system.

which is the same in any car. didnt think the FD would be any different.

[SmbFD3S]

Ok fair enough, i bow down to Tims knowledge.  Please read page F-96 of the Mazda manual....

[a.tapos]

theres a fuel pump relay you could just bridge that with a paper clip,i crank the engine with no plugs and coils disconnected to prime pump and build up oil pressure then heat the plugs and fit them,if theres one thing you really dont need to worry about its lack of fuel and if it does flood whip the plugs out again and crank with the egi fuse out to disperse crap fuel vaseline and oil,job should be a goodn

[Jim_rx7]

it started! Cheers chaps!

[a.tapos]

well done mate,tis a good feeling,make sure its bled properly or it will eat itself