GRiSO 1100 running issues

Hello chaps after some help here
my 1100 has been getting harder to start over the last little while not kicking in on both cylinders immediately
now worse
changed all the plugs old ones didnt seem that bad
seems to hold back when under load sort of surges sometime cuts out completely like running out of fuel (dies slowly)
when starting I have to open the throttle now used to just start
I can hear it popping in the exhaust when ticking over
any ideas plug caps? fuel filter?
TIA Steve

The first Grisos had some issues with the fuel hoses used inside the fuel tank. You need to disamble the fuel pump and check the hose. Mine was swollen. Nearly same issues. After replacing no issues anymore. Good luck. Did you check the inner sparkplugs too? [You must be registered and logged in to see this image.]

Yes did the inner plugs turned down a plug socket
I recognised that bloody filter got ducatis so the pump and filter are in the tank Oh deep joy!
Regards Steve

Drain the Fuel tank, then dismantle it, the fuel connectors are not easy to disconnect sometimes, use some silicone spray... After diconecting everything turn the tank upside down. Only a few screws, then you can remove the whole unit. I had to do this in the middle of nowhere, because the hose slipped of the fuelpump... so you can do it at your place. Get yourself a good hose - needs to be fuel and alcohol resistant! And some Stainless steel hose clamps. It will only take you 1/2 hour.

Sidestand switch?

side stand switch is ok did check it as its a ducati type problem
Im investigating the fuel pump/hose
Regards Steve

Well not having any luck here
GRiSO 1100 starts with difficulty on one then kicks onto two quite quickly then just fades away revs drop to nothing
sometimes it will rev and sound great go to pull away it just dies
replaced both sets of plugs
fuel pump and filter short hose was a bit bulgy so replaced that
any ideas chaps
Regards Steve

now not starting at all
have a spark so guess something fuel related can hear the pump priming
it ran for a bit after the new parts no better tho

Are the valves tight?

When it stops all together is there a spark? If it fades as it gets hot I'd check the phase sensor when hot.

Another thought. While you had the pump out did you notice how much water there was in the tank?

One thing that can cause fuel ptessure issues is the fuel pressure relief valve. It's a cheap shitty little steel thing and the springs scan rust and weaken. Needless to say you can't buy them from Guzzi as a spare part...

I found a source and kept a note of it.

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Not much water in the tank at all
now got it running changed all the hoses in the tank found a bad clip I think perhaps it was losing fuel pressure
it did lose all pressure when the hose came off and it totally stopped
Thanks for a the help
Regards Steve

Just to conclude it was a dying fuel pump causing all the issues
replaced and now running well
Thanks for all the help
Regards Steve

Steve, could you tell me what pump you replaced it with, and where you got it from? I am experiencing similar symptoms with my GRiSO and may have to go the same route.

If the tank gets a lot of water in it, either from a blocked filler drain or simply condensation the fuel pressure relief valve, a cheap and nasty little thing with a steel spring inside, can corrode and the spring can break or rust away resulting in diminished or inadequate fuel pressure.

Needless to say Guzzi don't supply the valve as a spare part and expect you to purchase a new pump at an absurd price! Bugger that sez I!

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Still expensive but cheaper than a new pump.

Here is where I got the pump [You must be registered and logged in to see this image.]

That is a good price

Regulator here[You must be registered and logged in to see this image.]

Thanks Steve!! That is very useful.