[rleffler]

I'm looking for the amount of fuel pressure that the mechanical fuel pump (engine attached) on a yio-540-d4a5 is supposed to yield. Aircraft Spruce's listing states 25-30psi. Is this what I should expect?

The reason I'm asking is that mine is only generating about 23 psi.

Is there any effective way to test, short of taking it off and sending back to Lycoming or a certified shop?

Thanks,

Bob

 

[Russ McCutcheon]

My IO-360, Same pump??? It does 20psi at full power and 22 to 24 in cruse, the pump it replaced was the same.

 

[rleffler]

I found the answer, it's 14-45 psi. I've ben told by several sources I don't have an issue at 23 psi.

bob

 

[Walt]

The fuel pressure spec for the Precision Silver Hawk is 20-50 psig.
Lycoming spec for IO engines is 18-28 psi.