fuel pump run with key off(sometimes)

[mysvo71]

hello,
on my 86 svo the fuel pump occasionaly continues to run after i turn the key off. also when it stays on i can hear a hissing noise from the return line where it conects to the fuel rail. so before i start changing parts (fpr , injectors, relays etc. ) i thought i might ask for advice.
thanks

[SVOPaul]

You should not have any "hissing" noises unless there is a leak somewhere...do you smell any fuel??

Your pump should not run without the key on, I would check the fuel pump relay under the driver seat and make sure it is not sticking....

[svobud]

If the relay is sticking - you'll hear the pump running - relay is located under the driver's seat.Had the exact same thing happen to me once...

hissing? dunno about that one.

[mysvo71]

could the hissing be fuel cycling past the regulator?? there are no leaks or fuel smell???????

[SVOPaul]

Well, if the pump is running then you could be hearing the fuel passing to the return line back to the tank....

[mysvo71]

thanks,
i'll replace the relay and see if it happens again.