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Discussion Starter · #2 ·
Hmm..no one knows.

How about this one..since our fuel pressure regulator is in-tank, is it strictly electrical or does it also work somewhat off of vacuum and have a vacuum hose attached to it? I'm guessing electrical since why would you have such a long vacuum hose...
 

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It is MPFI...

the MPFI (Multi Port Fuel Injection) units operate with one throttle body and then the air/fuel mixture is then directed into each individual cylinder through separate ports.

When it comes to SEFI (Sequential Electronic Fuel Injection) the same results (getting a air/fuel ratio into the combustion chamber) is done by another means. SEFI pulses the injectors once per crankshaft revolution. SEFI provides optimum mixture ratios at all stages of combustion. Combined with its immediate response characteristics, it permits the engine to run on the leanest possible air/fuel mixture, which not only gives better performance but also reduces exhaust gas emissions. SEFI is controlled directly by the vehicle's ECM/PCM, which automatically adjusts the air/fuel mixture in accordance with engine load and performance. Because each cylinder is equipped with an injector mounted immediately adjacent to the intake valve, much better control of the air/fuel mixture ratio is possible.

Better control=more performance.

I hope this helps.
More info found here....

http://www.thirdgen.org/techboard/v6/60923-whats-difference-between-sfi.html
 

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Yw....
 
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