FD fuel pump- hot start flooding
11-03-04, 07:16 AM
#1
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FD fuel pump- hot start flooding
I upgraded to an FD pump & had a hell of a time starting.
It flooded every time.
I found the problem - a leaking injector.
Now it starts cold, but floods on hot restarts.
I finally installed a push button circuit from the start wire to a relay to ground the pump's resistor relay.
Now I can hold low voltage to the pump for hot restarts.
One little upgrade can take a full day & 3 evenings.
It flooded every time.
I found the problem - a leaking injector.
Now it starts cold, but floods on hot restarts.
I finally installed a push button circuit from the start wire to a relay to ground the pump's resistor relay.
Now I can hold low voltage to the pump for hot restarts.
One little upgrade can take a full day & 3 evenings.
11-03-04, 07:58 AM
#2
I find that very interesting. I installed one on my S5 TII 2 years and never encountered any problems. The FD pump doesn't push that much fuel to overpower the regulator like a Walbro, so what do you believe caused the problem. Do you believe it could be the 12 volts that you have directed to pump at all times? Just curious.
I have never seen the flow rates on the Mazda pumps, but I do have all 3 Mazda pumps in the garage n/a, TII, and 2 other FD pumps, and always wanted to check the flow, but have never found the time or energy, but maybe oneday.
I have never seen the flow rates on the Mazda pumps, but I do have all 3 Mazda pumps in the garage n/a, TII, and 2 other FD pumps, and always wanted to check the flow, but have never found the time or energy, but maybe oneday.
11-03-04, 10:25 AM
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From what I've read & observed, the pump voltage goes high when cranking & when under boost.
It flooded on the very first attempt to start after the pump swap, so I suspect I had a weak primary injector.
The FD pump is stronger, but who knows what the specs are?
Anyway, that fixed the cold start flooding.
My spare 4 injectors are going to crusinperformance after he replies my e-mail.
It flooded on the very first attempt to start after the pump swap, so I suspect I had a weak primary injector.
The FD pump is stronger, but who knows what the specs are?
Anyway, that fixed the cold start flooding.
My spare 4 injectors are going to crusinperformance after he replies my e-mail.
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