Low fuel pressure to the fuel rail

1997 CADILLAC STS
190,000 MILES • V8 • 2WD
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MECHANIC1957
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  • 1 POST
I put in a new fuel pump there's not much press at fuel rail but there is at pump. will run on spraying fluid directly in throttle body and randomly it will start and shut off.
Oct 10, 2020 at 10:35 AM
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KASEKENNY
  • ✓ASE Certified Mechanic
  • 18,907 POSTS
  • ASE Certified Mechanic
Couple things. When you say there is not much pressure at the rail but there is at the pump, how do you know that? Did you check the pressure at the fuel rail?

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If you did what was the PSI?

If you have low pressure at the rail, but good pressure at the pump, then you have a restriction in the line which is most likely the filter. I would suggest changing that and go from there if the pressure is good at the pump and low at the rail.
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Oct 10, 2020 at 11:17 AM
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