XFI Fuel pressure logging - no reading

[CS99]

I have my fuel pressure sending unit hooked up to pin C12. With an ohmeter, I checked the voltage at pin C12 and I am getting different voltages depending on what the fuel pressure reads. The range is .5V to 4.5V. I know that the sensor is working. Gain is 25 and offset is -25. Whatever I put in as an offset is what the FAST system displays for my fuel pressure.

 

[HighPSI]

Try using:
Gain: 25
Offset: -12.5
High: 100
Low: 0
Decimal: 0

 

[CS99]

Try using:
Gain: 25
Offset: -12.5
High: 100
Low: 0
Decimal: 0

Fuel pressure reads -12.5
It seems whatever I put in the offset is what the fuel pressure reads. It stays -12.5 all the time. The wire from my fuel pressure sending unit is connected to the c12 wire BETWEEN the XFI box and the CASPERS adaptor.

 

[kidglok]

you will have to set the gain to 1 and the offset to 0 then display 2 decimal places. this will give you the raw voltage.

when you do that record the values at 2 known pressures (zero psi and 38psi for instance)

report back

 

[HighPSI]

I spoke on the phone with the customer. The XFI isn't seeing voltage, that's why the reading is always the same as the offset. I have him doing a couple things and he can post up what the problem and solution were, to possibly help others.

 

[CS99]

I was on the wrong pins. The info that I had showed that pin c11 was under c10. Pin c11 is on the opposite end of the plug. I googled xfi pinout and found Norbs diagram, which is 100 percent better than what was in the XFI manual.

 

[kidglok]

I was on the wrong pins. The info that I had showed that pin c11 was under c10. Pin c11 is on the opposite end of the plug. I googled xfi pinout and found Norbs diagram, which is 100 percent better than what was in the XFI manual.

glad u figured it out!

 

[Chuck Leeper]

A suggestion: B4 you rely on the transducer readings, compare it with a known good mechanical gauge.
I just tested 3 new Autometer transducers...2 were nutz.

 

[CS99]

A suggestion: B4 you rely on the transducer readings, compare it with a known good mechanical gauge.
I just tested 3 new Autometer transducers...2 were nutz.

LOL....I was already think that this morning. Will put a mechanical on the fuel rail tomorrow and verify !