Were is pump filter - Whirlpool Duet GHW9150P Front Load Washer

I assume you mean backwash the filter. The pump will always pump in one direction.

I am also assuming that you have a sand filter with a filter control valve.

If your filter's waste discharge needs a hose attached to route the discharge to a ditch or other suitable location, be sure to attach the hose before beginning this process.

Turn the pump off. Set the filter control valve to the backwash position. Turn the pump on and run for 30 sec to 1 minute until the water being discharged looks clear. If your filter control valve has a Rinse setting, turn the pump off, set it to Rinse and run the pump for about 30 sec. Turn the pump off. Set the Set the filter control valve back to Filter and turn the pump back on.

Air release valve for air trapped inside filter chamber

Intex 1000 GPH Easy Set Pool Filter Pump Instructional Guide 637R

The link has a set-up video for the 637R pump. Make sure water flows out of the air valve on the top of the filter cover. This will purge air out of the filter and prime the pump. Hope this helps you....

b> VALVE SETTING FUNCTIONS OF VALVE POSITIONS FLOW DIRECTION THROUGH VALVE FILTER PUMP - TOP - THROUGH FILTER - BOTTOM - RETURN For normal filtration and vacuuming pool through filter. BACKWASH b> PUMP - BOTTOM - THROUGH FILTER - TOP - WASTE For reversing flow for cleaning filter. RINSE b> PUMP - TOP - THROUGH FILTER - BOTTOM - WASTE For initial start-up cleaning, plus resetting filter bed after backwashing. WASTE b> PUMP - WASTE For vacuuming directly to waste, lowering pool level/draining pool. CLOSED b> NO CIRCULATION PAST PUMP PORT For shutting off all flow to filter and pool. RECIRCULATE b> PUMP - RETURN For bypassing filter, but circulating pool water. May be plumbed for "off-system" pool water access. Ideal for Jet-Air® fittings. WINTER b> VALVE NOT IN USE
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You will simply remove the old sand from your pool filter and follow the instructions from your users manual like you are adding sand for the first time. In case you don't have it, I am going to paraphrase it for you below.

1. Be sure correct amount of filter sand media is in tank and
that all connections have been made and are secure.
IMPORTANT: To prevent unnecessary strain on piping system and valving, always shut off pump before switching Filter Control Valve positions.
The correct amout of sand can be determined with this link: http://www.backyardcitypools.com/pool-filters/Filter-Sand-Requirements.htm

2. Set your controls to the backwash position.

3. Prime and start pump according to pump instructions. (be sure all suction and return lines are open), allowing the filter tank to fill with water.

4. Once water flow is steady out the waste line, run the pump
for at least 2 minutes. This initial backwashing of the filter is recommended to remove any impurities or fine sand particles in the sand media.

5. Turn pump off and set valve to RINSE position. Start pump and operate until water in sight glass is clear—about 1/2 to 1 minute. Turn pump off, set valve to FILTER position and restart pump. Your filter is now operating in the normal filter mode, filtering particles from the pool water.

6. Adjust pool suction and return valves to achieve desired
flow. Check system and filter for water leaks and tighten connections, bolts, nuts, as required.

7. Set your filter to the "filter" position.

Oil Pump

Removal

1. If necessary, remove oil bypass filter (oil filter).
2. Remove oil pump and filter body to engine front cover retaining bolts and remove oil pump and filter body from engine front cover.
3. Inspect oil pump body seal (6C639), oil pump and filter body and engine front cover for distortion and wear. Replace components as necessary.

Installation

1. Position oil pump and filter body on engine front cover and install retaining bolts.
2. Tighten the small engine front cover retaining bolts to 8-11 Nm (71-97 lb-in) . Tighten the large retaining bolts to 23-32 Nm (17-23 lb-in) .
3. If removed, reinstall oil bypass filter (oil filter).

filters are too good for pump system.

These pool pumps seam to over heat fast, no quick fix.

* Try getting more air flow around pump.
* Only use pump when using pool or near by.
* Use a pool cover - will help stop dirt/rubbish getting into pool - less to filter.

Yes, it could be the fuel filter, but the pump may be on the way out also. Change the filter first. I have seen the pump get replaced and a noise still exists. It usually caused by the fuel filter.