fuel pressure fluttering

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fuel pressure fluttering

Post by Cruisin428 » Fri Nov 23, 2018 1:10 am

my gauge for the fuel pressure at the regulator is fluttering about 6 - 8 PSI around 40 PSI

How steady is the fuel pressure typically?

If this is not normal -
I wouldn't think the problem is the fuel pump, Im thinking the pressure regulator may be slow to respond and causing the fluttering??
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Re: fuel pressure fluttering

Post by cgrey8 » Fri Nov 23, 2018 10:08 am

If this is at idle, you may be seeing the high speed fluctuations of your intake manifold pressure. And being the fuel pressure regulator's job is to have the fuel pressure track with the fluctuations in the intake manifold, this may be what you are seeing. However I would expect that at higher RPM/Loads, you'd see this smooth out a bit. But at lower RPMs where reversion is going to be the most pronounced, it's not surprising particularly if your vehicle has an aggressive, wide duration cam.
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