Engine loses power when starting off.

[scottfab]

Originally Posted by VetteVet

Scott,

I'm in agreement with you. That was my first thought when he said it only happens when car is up to temp. The secondary pump is commanded on full time by the ECM until 176 deg (or 177, I can't remember the exact number). Once that temp is reached, the ECM turns off the secondary pump and only energizes it when secondary port throttles are commanded open. The secondary pump running full time while the car is warming up would mask any primary pump problems below that temp.

Jep

That is why I put in a "bypass" switch to force the 2nd pump to stay on in an emergency.
The idea is, if the primary ever fails again I can get home without a flat bed. This thread shows both switches I put in. The first is a switch on the fuel pump "pig tail" it is ONLY good for testing pressure with engine off. (important to remember) the second switch is shown in the very last pic in the first post at this link: http://zr1.net/forum/showthread.php?...ight=fuel+pump
It is for forcing the 2nd pump on when the engine is running.
Sorry the pic is HUGE. You have to scroll over to the right to see it.