Fuel pump fail on my 91 ?

[Vette73]

Well pulled the fuel pump assembly and one of the hoses was off the pump....What a bummer.....Should have made the repair at the rest area.....Pump is not back in car yet because it got to dark out and the car is on the street......I'm guessing that's the culprit..

[billschroeder5842]

Originally Posted by Vette73

Well pulled the fuel pump assembly and one of the hoses was off the pump......I'm guessing that's the culprit..

Well, that is a relatively easy fix. Good for you that you discovered the issue. BTW.... How many miles on your 91? I'm still on the original fuel pump with 80k and and wondering if I'm pushing fate?

[Vette73]

Originally Posted by billschroeder5842

Well, that is a relatively easy fix. Good for you that you discovered the issue. BTW.... How many miles on your 91? I'm still on the original fuel pump with 80k and and wondering if I'm pushing fate?

I replaced my pumps about 1,000 miles ago...Car has 51,000 miles.....Reason I replaced them in the first place was a mistake on my part.....Car ran great up until temp reached about 170 ..Car would hesitate until about 3,000 rpm than it would be fine.....

I thought it was the pumps....Wound up being a sensor on the passenger side near the header.....

[A26B]

Originally Posted by Vette73

I replaced my pumps about 1,000 miles ago...Car has 51,000 miles.....Reason I replaced them in the first place was a mistake on my part.....Car ran great up until temp reached about 170 ..Car would hesitate until about 3,000 rpm than it would be fine.....

I thought it was the pumps....Wound up being a sensor on the passenger side near the header.....

That would be the O2 Sensor shorted out. At temp below "about 170F" and above "about 3000rpm, engine management is in open loop and ignores O2 sensor signal.

[George Maz]

Correct.
I remember John changing that O2 sensor recently.

[dredgeguy]

Originally Posted by Vette73

Well pulled the fuel pump assembly and one of the hoses was off the pump....What a bummer.....Should have made the repair at the rest area.....Pump is not back in car yet because it got to dark out and the car is on the street......I'm guessing that's the culprit..

Yup, I had the exact same issue this past spring. A hose had come loose so we replaced the hose clamps with new stainless steel ones.

[TX '90 ZR1]

Remember that there are 2 different size hoses.
Outlet from "Y" is 3/8". From "Y" to the pumps is 5/16".
Might also consider getting a new "Y" from Carter to replace the plastic one. My plastic one developed a crack and was the cause of pressure leak down.