Gauge problem I think. I have the Dipricol Optix electric fuel pressure gauge thats doing funny things, when I first installed it it was reading about 17.5 psi now today when I started the truck it was reading about the same I drove it about 15 miles and I look up and its sitting at 30psi well I know thats not right so I shut the truck off and then back on and it still shows 30psi at idle it goes down to about 24.5 to 25 at 70mph.

I am thinking its the sending unit.

Could it be my Airdog? or could it be the gauge itself?

Any body got any other suggestions?

 

Probably the best place to start is to have a mechanical gauge that you can temporarily install to get a true fuel pressure reading.

Very unlikely that its the AirDog.

 

Yeah I didnt really think it was the Airdog, just trying to cover all my bases before I start buying things.

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Well I took out the sending unit and put a mechanical gauge on it and I am getting 17.5psi.

So is it the sending unit or the gauge?

 

Are you using an isolator before the sending unit? If so, it's most likely there. Otherwise, it's probably the sending unit or a bad ground.

Dave

 

Electric guages are notorious for grounding problems. Make sure youve got some bare metal, as well, use a different grounding point than your other guages. Always try the simple/cheap things first before buying the expensive parts.

 

Nope no isolator and the grounds good the two other gauges are grounded to the same spot and they work just fine. So I need a sending unit for the Dipricol Optix electrical fuel pressure gauge. Wow that didnt even last 6 months, Wonder if it has a warranty.

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Well I will try moving the ground then.

 

it should have a warranty but remember the sending unis ground themselves when you screw them in... so is the gauge grounded good? and i would call and check on the warranty...im saying it has one, i have had a oil pressure sending unit on my truck for a year, and it still works fine....

 

I know autometer wants you to use a pressure restrictor as they have same problem with the sending unit going bad.

 

Pressure spikes on the CR's are not a problem like the VP's. However, I did use about 6" 's of rubber hose between my electric sensor and the port to isolate it from vibration. The sending units do not like vibration at all.

 

Well I got this problem fixed, and thanks to Jim at Upstate Diesel Performance for getting this taken care of under warranty.

It was the sending unit, popped a new one in and it was back to normal 17.5 psi