Code 95 Secondary Fuel Pump Circuit Failure

[webslinger67]

i pulled codes on my 90 gt today and the only one i got was 95, Secondary Fuel Pump Circuit Failure


Anyone give me some ideas on where to trouble shoot this....

 

[jrichker]

Code 95 - the following test path is for 86-90 model Mustangs.

The 95 code is because at one time or another, the fuel pump relay hiccupped and didn't provide power the pump when the computer told it to run. Sometimes this is a one time thing, other times it is a no run or runs poorly condition.

To help troubleshoot the 95 code, follow this link for a wiring diagram http://www.autozone.com/images/cds/gif/large/0900823d80167162.gif

Using the diagram, check the red/black wire from the fuel pump relay: you should see 12 volts or so. If not, check the inertia switch: on a hatch it is on the driver’s side by the taillight. Look for a black rubber plug that pops out: if you don't find it, then loosen up the plastic trim. Check for voltage on both sides of the switch. If there is voltage on both sides, then check the Pink/black wire on the fuel pump relay: it is the power feed to the fuel pump. No voltage there, check the Orange/Lt blue wire, it is the power feed to the fuel pump relay & has a fuse link in it. If there is good voltage there & at the Pink/black wire, swap the relay.

Some Mass Air conversions neglect to run the extra fuel pump wire, and they always have a 95 code. See http://www.stangnet.com/tech/maf/massairconversion.html for more information on the Mass Air wiring conversion.

 

[webslinger67]

ok... i did a fuel pressure test...

now i wanna make sure, on a 1990 GT 5 speed , there is only one Schrader valve on the fuel rack right?

if that is the case, i am in big trouble...

i only have 20lbs of pressure going on the rack, whether i pull the vacuum line on the regulator or not...

what should i have? (cringe)

could the relay be bad and i would only have half the pressure i think i should?>

i think that is why its hard starting... but i would like to know all the possibilities of loss of pressure without changing the fuel pump....

i even added pressure to the fuel regulator , hence driving the fuel pressure up. thinking the seat was bad in it..... didnt change pressure one bit...

 

[Aryan15]

Try replacing the fuel filter, squeezing return line, or if your worried about a high resistant relay, bypass it.

 

[webslinger67]

where is the relay located on a 90 gt hatchback?>

and i have already replaced the filter when i did the tuneup

 

[Aryan15]

Mine is under the drivers seat. Not sure on the 90.

 

[HISSIN50]

As Aryan said, a '90's FP relay is also under the driver's seat. By then they had done away with the FP relay bracket as I recall, so the relay might be under the carpet.

 

[jrichker]

now i wanna make sure, on a 1990 GT 5 speed , there is only one Schrader valve on the fuel rack right?

if that is the case, i am in big trouble...

i only have 20lbs of pressure going on the rack, whether i pull the vacuum line on the regulator or not...

what should i have? (cringe)

could the relay be bad and i would only have half the pressure i think i should?>

i think that is why its hard starting... but i would like to know all the possibilities of loss of pressure without changing the fuel pump....

i even added pressure to the fuel regulator , hence driving the fuel pressure up. thinking the seat was bad in it..... didnt change pressure one bit...

I understand your reluctance to deal with replacing a fuel pump. I have done it twice and it is an aggravating job.


I would advise you to check the voltage at the tank side of the quick disconnect located near the pump. The ground wire and the power feed wire both pass though a quick disconnect. Measure the voltage between chassis ground and the wiring on both sides of the connector by probing the connector from the rear on both halves of the connector.

To do the next step, you'll need to jumper the fuel pump test point and turn the ignition switch to the run position. You need constant power to the pump to do the test.

If the voltages are within the specs I have posted, the connector is not the problem and the pump is highly suspect.

 

[webslinger67]

the attachment for the voltages is not coming up for me, can you direct me there, or maybe check it again , thanks man...

 

[webslinger67]

PLEASE SEE MY OTHER POST FOR THE SAME PROBLEM

please goto this post and leave me your opinion...

thanks

http://forums.stangnet.com/showthread.php?p=6805224#post6805224