Fuel rail pressure

walterschweigert · Post by **walterschweigert** » 09 Aug 2010, 13:49

What should the fuel rail pressure be with the gauge hooked up, key in position two with the engine NOT running on a 2007 xc-70?

With the engine running I have read that it could be anywhere from 42 to 51 psi, depending on barometric pressure.

Thanks in advance.

Walter

Volvofix1 · Post by **Volvofix1** » 09 Aug 2010, 15:23

Walter..fuel press. sounds O.K. why are you checking it ? Dick K. from Fla.

walterschweigert · Post by **walterschweigert** » 09 Aug 2010, 16:14

I have a stumble which sometimes is followed by a stall immediately after start up. It does it after sitting overnight or after several hours. It NEVER does it on a restart.

I never said what my fuel pressure observations were. But, when running it starts out at 51 psi immediately after start up and then settles to 44-45 when it idles down.

My original question was: What should the fuel rail pressure be BEFORE the engine is started, with the key in position two? My theory is that perhaps the fuel pressure at that point in time may not be building sufficiently and if so may be causing my intermittent stumble and stall. I am observing pressures under these circumstances (key in Pos 2 w/Eng. off) anywhere from 0 to 50 psi, depending on which way the wind blows.

walterschweigert · Post by **walterschweigert** » 12 Aug 2010, 15:24

Anyone?

bump.