Starts great uphill?

2003 GMC SAFARI
180,000 MILES
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SKY74
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It starts instantly in the morning when cold but once it's been running it takes two, three five second cranks to start, even if I let it sit for a few hours. However, if I park it facing uphill it will start right up instantly.
Mar 23, 2023 at 9:08 PM
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STRAILER
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I have seen a weak fuel pump cause this issue, but to be sure let's do a fuel pressure test. here is a guide to help with the instruction for your car and how to replace the fuel pump in the images below:

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

Fuel System Pressure (w/fuel pump running) .................... 379 - 427 kPa (55 - 62 PSI)

Fuel System Pressure (after fuel pump shuts off) .................... 34 kPa (5 PSI)

Fuel System Pressure Drop (after 5 minutes) .................... 14 kPa (2 PSI)

You can rent a fuel pressure gauge for cheap at the local auto parts store. Check out the images (below). Please let us know what happens.
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Mar 24, 2023 at 6:50 PM