question about trex fuel pump - Northern California Ford Owners

This is topic question about trex fuel pump in forum Tech Talk at Northern California Ford Owners .

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Posted by 1sicklx (Member # 1018) on :

should i put a on/off switch on the trex when i intalled it so i save fuel during normal driving, or should i have it on at all times when i am driving... thanks

Posted by st5150 (Member # 51) on :

Its meant to be ran all the time. If you put an on-off switch on it, it will only act as a restriction to your intank pump.

Posted by 1sicklx (Member # 1018) on :

thanks for the imput, i was thinking it would overheat or something thats why i ask...

Posted by st5150 (Member # 51) on :

quote:
Originally posted by 1sicklx:
thanks for the imput, i was thinking it would overheat or something thats why i ask...

Thats only true for some pumps like the Weldon's.

Posted by v8302stangs (Member # 530) on :

Yeah I would imagine that your computer would control the fuel anyways, so having more pressure in the line would really have very little effect.

Posted by st5150 (Member # 51) on :

quote:
Originally posted by v8302stangs:
Yeah I would imagine that your computer would control the fuel anyways, so having more pressure in the line would really have very little effect.

Now that statement made no sense.

Only '99+ cars have the EEC control the fuel pump variably. Pre '99 cars, the EEC just flicks the fuel pump relay on and off with the iginition switch. Post '99 cars, the EEC monitors the fuel pressure at the rail via a pressure sending unit and accordingly drives the pump.

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