Honda gx390 losing pressure

[Tutster]

Hi all
just s quick one my honda gx 390 seems to be losing pressure then next time i pull the trigger its great again then when I stop and start again pressure is **** once again anyone any idea what's causing this it's doing my head in
Cheers all

 

[Pjj]

Hi all
just s quick one my honda gx 390 seems to be losing pressure then next time i pull the trigger its great again then when I stop and start again pressure is **** once again anyone any idea what's causing this it's doing my head in
Cheers all

Unloaded valve ?

 

[Truckcab79]

Hi all
just s quick one my honda gx 390 seems to be losing pressure then next time i pull the trigger its great again then when I stop and start again pressure is **** once again anyone any idea what's causing this it's doing my head in
Cheers all

Maybe a complete red herring but my Jetmac started doing this after its winter lay-up. Was as simple as the inline filter being blocked. I didn’t even know it had one.

 

[Tutster]

Maybe a complete red herring but my Jetmac started doing this after its winter lay-up. Was as simple as the inline filter being blocked. I didn’t even know it had one.

Where was the filter located please buddy

 

[Tutster]

Unloaded valve ?

I'll take a look. See if it playingbup cheers

 

[Pjj]

Where was the filter located please buddy

There will be a small filter in the brass fitting ware the water goes into the pump it will look something like the picture below

 

[Herm]

Yeah I bet it's the y filter. I had the same. Take it off, give a good clean and put back in. Mine had some **** in it, cleaned out and good to go again,

 

[Pjj]

Yeah I bet it's the y filter. I had the same. Take it off, give a good clean and put back in. Mine had some **** in it, cleaned out and good to go again,

If the filters blocked you don’t usually get decent pressure at all the op said he gets good pressure releasing the trigger and squeezing it again ? But it could affect the flow rate they don’t take much dirt to block them they are tiny .

 

[Truckcab79]

If the filters blocked you don’t usually get decent pressure at all the op said he gets good pressure releasing the trigger and squeezing it again ? But it could affect the flow rate they don’t take much dirt to block them they are tiny .

Mine was as per his description with the added crunching and banging of the unloader valve. There was a tiny bit of grit in it but the ‘blockage’ was actually a fine film of limescale in the mesh. Wasn’t needing the machine for a little while so no rush and I soaked it in cleaning vinegar for a few days.

Must buy some spare mesh. Seem to be few and far between. Probably because the whole assembly is only about £8. A company called AC pressure washing stock them though.