Sound at Idle HELP!

[RT-AWD]

Just sitting at idle after a good drive I'll hear a pressure relief type sound like someone was removing air from a tire. The sound happens for about 1-3seconds and then goes away for about 10-15 seconds and the happens again. Its coming from the rear, I'm thinking its my fuel pump but i don't know why it would make this noise HELP!!!

BTW its a walbro 255lb

 

[RT-AWD]

Anyone know?

 

[MrBoxx]

Please don't bump your threads.

Take out the back seat and uncover the fuel pump access panel (if 1g's have them, which I think they do). Does the noise get louder? If so, then the problem is in the fuel pump area. Do you have an AFPR for that 255lph pump?

 

[RT-AWD]

sorry and no i dont, i only use the safc. it doesnt get louder. its the same pitch everytime

 

[viprez586]

Are you sure it's from the rear?
Possibly you could be hearing your EVAP purge.

 

[RT-AWD]

I'm 80% sure sounds like its coming from the gas tank area or right in front of it.

 

[Nvisabl]

I'm 80% sure sounds like its coming from the gas tank area or right in front of it.

EVAP purge is my guess also.

 

[viprez586]

I don't have my logger handy but i believe you can command evap purge on mmcd.

I'd narrow it down by having someone ride with you, or if it only occurs at a stop, beat it around the block and have someone waiting upon your return.