ok so i installed one... and something is way odd, or my car is crazy.

when i turn just the ignition on.. the gauge shoots up and reads 40psi.. when i start the car, it drops all the way past Zero. only when i hit the gas to rev it does it move.

ok.. so i wait for the car to warm up... and take it for a drive.. when i hit the excellerator(no matter if its hard or soft) it shoots to 40psi.. as soon as i left off.. the gauge goes all the way back down.. its almost acting like a boost gauge..

so when i come back from a run, i let the car idle and now its bouncing from 10-25psi.. and keeps fluctuating.. but if i rev it and let off.. it shoots up, then back to zero..


what the hell? is this what its supposed to do??

im starting to get mad


help please.

 

Where did you mount the gauge sending unit?

 

on the fuel rail.. i took out the schrader valve of course.

 

I would call autometer. I have one and it is on the money. Does your car run OK? What did you connect the wires for the box to?

 

i connected the wires according to the instructions that it came with. i used 16gauge wire to extend the ones that needed it.

 

Where exactly did you run the wires, i.e. what did you tap into for key on ignition, etc?

 

well from the box.. it needed 1 ground and 1 12v.. i sent a wire directly from the box to the battery using a 1amp fuse like the inst. say. (a direct battery source) that wouldnt have to do with the pressure flipping out though

 

Did yours have a separate black box with power input, sender input, and gauge output? What model #?

 

You shouldn't hook up the sender directly to the fuel rail, engine vibrations will cause the sender to prematurely fail.
Mount the sender to the car with rubber isolators with a -4an line between the rail and sender.

Do you have a mechanical gauge you can hook up to check the rail pressure? If you do, tape it to your window and see if the mech gauge does the same thing.

 

Back to does the car run OK? If so, then it's a gauge or gauge module problem.

 

Also, if you ran it directly to the battery, your gauge would be on all the time. It should be run to a 12V source that's hot with key on.

 

Did you get this unit new,

sounds like he has this style setup,

 

Same one I have. Although they have one without the box:

http://hp.autometer.com/instruction_...ctions/571.pdf

 

yeah Zeph thats the same one i have...

so i need to route a 4an line from the rail to the sender?

where should i mount the sender then?



there is only 1 wire that confused me.. the "wire sheild".

the sending unit wire bundle, in the bundle of there are 4 wires. there are actually 5.. there is another wire in a light light green or white sheath.. then the wire with no sheath.. just bare wire.. i hooked the bare wire one to the "wire sheild". is that what is needed?

 

Mount the sender to the firewall and use rubber isolators to keep vibration to a minimum.

Not sure about the sender wires as I never hooked mine up. I ended up trading the setup for an RC Car.

 

If you bought that one with the black Box NEW. call autometer ask about the RECALL on them because the sender had premature failure and was know to leak with possable engine fire.

I sent mine back and got a new Full sweet one with out a box for free.

 

do we have to show proof of sale? i dont have a reciept i got it "brand new" from Ebay..

 

call and ask.. Just say You bought one from Summit Racing awhile ago and are just not getting around to putting it in.

Somoene told you about a recall. I dont think it should matter anyways.

 

keep in mind the fuel pressure is refrenced off of MANIFOLD pressure. but the gauge is showing pressure refrenced off of atmospheric pressure.

so at idle (or under high vaccum, like decel in gear) the gauge will read Low pressure.
at WOT it should read about the same as its set to.


you can test this by disconnecting (and plugging) the vac hose going to the regulator. the pressure will then remain constant.

 

just so you figure it out:


you turn the key on:
fuel pump kicks on.
manifold pressure = atmospheric pressure therefore gauge reads 40psi

you start the car:
the idling car makes a high vaccum.
the regulator sees this and sets the pressure so that it = 40 psi compared to the manifold.
the gauge compares it to atmospheric pressure, and shows it as really low.


you floor the car:
the manifold pressure almost equals atmospheric pressure.
the gauge reads 40PSI again.





got it?

 

i got it.. but thats not what is happening..


i turn just the ignition on.. it reads 40..

i start the car.. it reads way less than Zero

you tap the gas a little and it goes up to 40.. then back to beyond 0

you take it for a drive and use half throttle.. it reads around 25.. take your foot off.. beyond Zero

i just called Autometer and spoke to their tech.. he said there are no recalls on the product, but it could be the sending unit itself since he spent out 15min with me on the phone while i traced each wire..

now i have to send the gauge and the black box and the sending unit in.. BUT the cool thing is, he said chances are that they will replace it with the new style that doesnt use the black box.



also while driving on the freeway, occasionally the guage will shoot to 100psi, then back down, then all over the place.. so, i know its not me reading it wrong, or the hook up.. has to be someting faulty in it.

 

He didnt mention a Old recall? weird?

I got a letter in rhe mail from them stating I need to send mine back.

Oh well atleast your getting the better Unit when you return this one.