WTB RJC Front Mount

shmed

Member
ok. I installed a. 12 volt pressure sensor. an I can't get a reading. so. I. probed the 3 wires ok. good ground ok have 12 volts to sensor sensor wire. I have nothing ??
ok. to be clearer. lol. the sensor is on the car an is being tested while running so it is getting 43 psi off the fuel rail. on my volt meter I don't get a reading/ should I not be getting at least 2.5volt? is the sensor dead>? thanks for any input
 

Turbo6inKY

Short Guy
You should have constant power on the red wire, the black wire should be grounded, and you should be reading 0-5v off the signal wire (normally green or yellow) depending on the pressure.
 

shmed

Member
yes. have 12v. on reed. black is grounded. an getting 0 off the gray (signal wire). even when there's. 42psi against the sensor taken from the mech gauge
 

TexasT

Texas, Where are you from
Can you post the instructions? What brand sensor is it? Maybe the instructions are on the interwebz somewhere.
 

shmed

Member
its the fast brand. model 307062
I have the instructions. just can't post em says too large?
 
Last edited:

captndave737

Well-Known Member
I had this one. Say's 12v. That's what I did and it killed it. Got another one and used a 5v source and now it works fine. I think the instructions are wrong.
 

Attachments

  • IMG_4626.JPG
    IMG_4626.JPG
    1.8 MB · Views: 71

Jerryl

Tall Unvaccinated Chinese Guy
Don't understand why manufacturers don't make every sensor capable of 5.0-16v input with a 0.5-4.5V output. It would be super easy to do and eliminate guesswork and failures.
 

shmed

Member
yes I agree jerryl
sucks ive bought. 2 of these an fast just ignores the possibility the instructions or something is wrong.
 

TexasT

Texas, Where are you from
Don't understand why manufacturers don't make every sensor capable of 5.0-16v input with a 0.5-4.5V output. It would be super easy to do and eliminate guesswork and failures.
I'm sure they just buy what they can find and sell it to the public. This is where good service after the sale is monumental. These guys don't seem to be shining in that area. I'm with captndave737. I'd get another and put 5v to it to see if you can keep it from letting out the magic smoke. It appears that smoke you let out was like an alcohol fire. Not visible by the naked eye.

Not endorsing these but I bet they are that far from what everyone is selling. And Ive found them to work good if you dont direct mount them to the rail. It seems they dont like vibration so I got a -3 braided hose and remote mounted it.
 

Turbo6inKY

Short Guy
I'm sure they just buy what they can find and sell it to the public. This is where good service after the sale is monumental. These guys don't seem to be shining in that area. I'm with captndave737. I'd get another and put 5v to it to see if you can keep it from letting out the magic smoke. It appears that smoke you let out was like an alcohol fire. Not visible by the naked eye.

Not endorsing these but I bet they are that far from what everyone is selling. And Ive found them to work good if you dont direct mount them to the rail. It seems they dont like vibration so I got a -3 braided hose and remote mounted it.

Those are the same sensors I got off Amazon. They leaked. Especially if you're running E85. They'd last about a week.
I also used one for oil pressure and had terrifyingly low oil pressure readings that descended linearly with temperature. I was about the pull the motor when I tried an SSI from Caspers and bam - oil pressure was fine. Those sensors change readings when they get hot. I never cut one open, but I suspect the transducer is exposed directly to the working fluid on those. Better sensors protect the electronics with a stainless membrane.

I suppose if you can remote mount them to keep the vibration and heat away, they might last. Maybe. Everybody's mileage varies. Mine wasn't good. If you can remote mount them above the rail, there will be a pocket of air trapped against the transducer. Fuel won't ever touch it.

The SSI I got from Casper got plugged into the exact same wiring (5v power feed) and worked, so I'm with @shmed, I think the instructions might be wrong. SSI has two versions of the sensor. a +5v and a +12v. The +12v version actually works from +8v to +30v. But the +5v version doesn't work past ~7.5. BUT, the SSI Caspers sells have overvoltage protection. Feed it 12v and you'll get no reading off the signal wire, but you won't smoke the sensor like you do with the cheapies. Rewire it for +5v and it'll keep working.

If you get the sensor from Casper, the SSI sticker will still be on it. You can match the part number up on Amphenol's (they own SSI now) website and get the actual data sheet for the part.

I don't know about any other brands. Not knocking anybody's, just relating what I've dealt with.
 

Jerryl

Tall Unvaccinated Chinese Guy
When making decisions on data, better ensure the data is accurate! This applies to decisions made by both the ECU and the tuner.
 

TexasT

Texas, Where are you from



Maybe one of these if you are wanting a name brand sensor. The metripack I threw in for those starting from scratch. I think that is the one for this transducer. Mouser and others have stuff too.

And one thing I noticed in the instruction sheet posted is to not over tighten these things. Putting the housing in a bind can have adverse affects.
 
Top