1991 ZR1 Restore - Help! - ZR-1 Net Registry Forums

kapkanimd · 02-20-2022

Did some more testing today...

Both pumps are working, but I am still only getting 18-20psi fuel pressure... on top of that if I pinch off of the return fuel line, there is no change in pressure..

As mentioned the pumps are new Advance Auto (Car Quest) E219663 pumps from a same year 7.4L Suburban.. Which I am now realizing might just be the wrong pumps.... I just ordered new GM ones (EP381).. Hopefully that helps the fuel pressure issue..

Also discovered some lovely coolant under the passenger side dash.. I am guessing from when I used the heater to test it.. fml...

02-20-2022	#29
kapkanimd Join Date: Oct 2021 Location: Tampa Posts: 19	Re: 1991 ZR1 Restore - Help! Did some more testing today... Both pumps are working, but I am still only getting 18-20psi fuel pressure... on top of that if I pinch off of the return fuel line, there is no change in pressure.. As mentioned the pumps are new Advance Auto (Car Quest) E219663 pumps from a same year 7.4L Suburban.. Which I am now realizing might just be the wrong pumps.... I just ordered new GM ones (EP381).. Hopefully that helps the fuel pressure issue.. Also discovered some lovely coolant under the passenger side dash.. I am guessing from when I used the heater to test it.. fml... Last edited by kapkanimd; 02-27-2022 at 10:09 PM.