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My friend had a oil pressure gauge installed in his car recently and he's been telling me some of the pressures it's reading and I think either the gauge is bad or it was installed in the wrong place.

The relief pressure on his oil pump (stock subaru) is 85psi, so if the gauge is tapped post pump, then the max the pressure should read is 85psi. He said he constantly sees 100+ psi. Could the install location cause this or could it only be a faulty gauge? I guess if the tap is just prior to the relief valve it could read higher than 85psi, but that valve is built into the pump so I don't know how that's possible.

Maybe it's a gauge vs absolute pressure issue?

I guess the other possibility is his relief valve never opens!

Any thoughts.

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2011/2012 Autox VP
2013/2014.5 President
2013 Top Gun

2015 Fit

22R-EC => 4G63 => D16Y7 + D16Y8 => EJ255 + K24Z2 => K20Z3 + K24Z2 => K24Z2 + M54 => L15B

Is it electrical or mechanical?

If electrical (which I would guess it was) I have seen the sendor's go bad as well as wiring or grounding issue that can cause this.

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2001 Honda S2000 - SOLD
2012 Boss 302
2003 BMW 330i

fwiw my spec e30 does the same thing (shows nearly 100 psi when oil is cold, between 20 and 75 when hot depending on revs). it's an electrical sender, i don't know whether it's plumbed before or after the relief valve.

Sorry, mostly an ignorant question but does the gauge manufacturer provide a zeroing procedure to confirm accurate OP readings?

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Steve Carter
1972 Datsun 240Z-- resto pics at http://picasaweb.google.com/srcartermd
2007 GPW Honda S2000-- STR 86

I don't know either, but it sure would make sense.

_________________
2011/2012 Autox VP
2013/2014.5 President
2013 Top Gun

2015 Fit

22R-EC => 4G63 => D16Y7 + D16Y8 => EJ255 + K24Z2 => K20Z3 + K24Z2 => K24Z2 + M54 => L15B