15 minutes to fill up a 95 Heritage?

Look at some videos on youtube on GM vat's bypass

I seem to recall that this is a fault for the pressure sensor. Check your pressure hose by taking it off of the pressure sensor and blowing into it and making sure it's not clogged. If it's clear, change the pressure sensor along with the hose (just in case the hose has a small hole in it somewhere along the tube). That should do it.

Check the filters in both ends of the hoses. If they are clogged, it will throw the timer off. If it figures on 2 minutes to fill but it actually takes 6 or 7 minutes, the timer won't be accurate.

I had the sane problem with my 2000 Saab Aero 2.3t at 135,000 mi. I took the black plastic cowl off from around the oil fill cap and intake to inspect vacuum lines and found a small line on the intake ( just beneath the clamp on the large rubber boot covering the intake facing me ) had come off. I replaced the line ( vacuum hose ) on the exposed fitting there on the front and test drove the car for 45 minutes with stops about every 15 min to park and shut off the motor. The problem was/is gone. I followed the line to the firewall area and a small vacuum canister that feeds the vacuum module on the air bypass tube next the radiator on the driver side. Don't know the technical terms for the parts but the problem surely has to do with that circuit which also has an electrical connection on the firewall intersecting canister. Hope this helps someone. I was lost.

You might have clog in water lines.
If shower is only place where low pressure exists, then clog is probably at shower valve.
Disassemble valve and see if clog will flush out.
From there, you have to keep moving back along cold water line looking for pipe filled with sediment or elbow that has obstruction.

If pressure problem is bad at every cold tap, but doesn't affect Hot water, then clog is inside Cold line somewhere after water heater connects to cold line.
Buy a pressure gauge that connects to water hose.
Buy adapter that also fits pipe thread.
For example Brady BTG 100.
Test outdoor spigot for baseline pressure.
Open cold tap inside house and see how much pressure drops.
Close cold line and open hot tap and see how much pressure drops.

Next, move pressure gauge along cold water line.
Take apart pipes and inspect for obstruction at elbow or pipes filled with sediment.
Look for any place galvanized pipe connects to copper pipe, since this will be likely place for obstruction because of bi-metal corrosion.

Add a comment for more free help.
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Clean out filter in the fill valve by removing the inlet hose at the machine end and pulling out and cleaning the plastic filter

Hi,
LF means that it is taking too long to fill. (If the water fill time exceeds ten minutes, the water valves are turned off and LF is flashed.)

Supply hoses could be kinked or clogged(some have screens in the end).
This could be a supply water pressure/flow problem. Make sure you have good water flow though the hoses to the machine. (Take off and try running into a bucket)
The water fill valve may be failing to open all the way or it could be clogged.
I hope this helps.

It sounds like you have a clog in your pump impeller, If you go into the front of the pump with the basket removed you can get into this with a long nose plier.

The fule tank vent tube is blocked/clogged. It's the little hole next to the filler hose that invites spiders that clog it up. Blow out the tube and it fixes the problem.