Hi, my stock L28e fuel pump failed & I decided to upgrade to a Walbro GSL-392 unit. Everything else on the car is stock & it is non-turbo (for the time being). My question is what should the proper fuel pressure (psi) be for the Walbro pump? I have a fuel pressure gauge taking readings before the fuel pressure regulator & with the stock pump it was also pretty steady at 30-35psi before it died. With the Walbro installed, I now see readings of 90psi which can fluctuate down to 40 psi. The pump is also making an oscillating, siren like noise as if it is laboring heavily & it is very hot to the touch (hotter on the fuel output side than the input side). Volt reading at pump terminals varies between 9.5 - 10.4vdc when it is making the noise.
It may then run quiet for a while with pressure at a steady 40psi & only warm to the touch, with volts at a steady 10.1vdc.
It almost seems like the pump is labouring trying to pass a "kidney stone" or some type of blockage. My worry is that I am slowly burning out the pump. I only let it run for approx. 5mins like this in the driveway.
Wanted to confirm the psi reading that a Walbro GSL-392 should produce before the regulator.
Any help/suggestions is appreciated.