1991 Ls400 96.000 Miles On It

[Salacak]

I hear some noise from the back, not all the time sometimes. Sometimes 10-15 seconds. I have to say fuel pump but it is not like a buzzing noise. Other day I turned of the engine and after that I heard like water running noise (Exactly like water running throught the pipes kind of noise) and it took 4-5 seconds and it was gone.

What is this? Fuel pump or something else? If this is a fuel pump how much labor we are talking about, I checked on ebay and people selling around $60-90 for fuel pump replacements is it easy to replace?

If this is not a fuel pump what else can be.

[RFeldes]

Canister and or fuel cap plugged.

[Salacak]

Can you explain little more,

thank you for your reply

[SKperformance]

You may have a collapsed sunroof drain that gets clogged.