really really badly need help please.

Started fine yesterday, no fuel getting to carb,.. It's gots petrol yeah? Common mistake made many times

the bike may have ran out of fuel prior to all this happening my wife has just informed me. now has lots of fuel in though

no no. The depression pump is the one on the right. the thing on the left with the bolts is probably the fuel gauge. The visible pipe is the fuel pipe. The one behind it is the air hose. Both are connected to the carburettor. The oscillating pressure from the engine acts on the diaphragm in the pump and lets the fuel flow.

I got a feeling it's something quite simple, are you trying with both kick and electric start?

so its the gold thing thats the fuel pump and i need to remove? when i ebay fuel pump it shows me this http://www.ebay.co.uk/itm/GILERA-DNA-50-GENUINE-FUEL-PUMP-/290960824594?pt=UK_Motorcycle_Parts&hash=item43be9dd912

yes i am doing it with both kick and electric with no luck at all.

OK http://www.ebay.co.uk/itm/Gilera-DNA-50-Petrol-Fuel-Tap-VACUUM-PETCOCK-/161074628363?pt=UK_Motorcycle_Parts&hash=item2580cbc70b
this is what we're on about.
The bottom pipe is the petrol. The bigger pipe is the air. The big gold flange is the housing for the diaphragm.

ok. so what is that and whats it do, so i need to replace that then and not the fuel pump? how is that removed from the tank as i cant see how it attaches, and again does it have any electrical connection or anything else?

i have to go shopping now but should be back in about 60 minutes, thank you for your help i do appreciate it

Daft question - is the spark plug cap on the plug?

that is the pump. It just lets fuel out of the tank but only when the motor is turning. It's not really a pump at all - just a valve. The fuel gets to the carb via that ole' gravity. The depression pump stops it doing this if the engine is not turning. Otherwise youre depending on the needle valve in the carb to stop the engine filling with petrol. And the floats/needle valve are not really up to the task.

Since fuel is a liquid and virtually incompressible, an engine full of fuel when kicked over tends to bend the connecting rod. So the fuel pump/valve prevents this happening.

As you can see from the link - it's pure plumbing. No electrics involved. Just a filter on one side and two pipes on the other. It's held on with a screw collar.

befor you mess with it - check the spark plug for a spark. Hold it against the frame & kick. if you got spark, it must be a fuel issue.

hi,

just got back from xmas shopping, i have a spark as the rac man checked the ht lead and it was sparking and the ht is connected to the spark plug,
i understand now so the gold thing ( depression pump ) allows the fuel out the tank via gravity and feeds it into the fuel pump and the fuel pump then pushes the fuel to the carb. I think i am understanding it and please correct me if i am wrong,
why would the depression pump suddenly stop working? could it be if it did run out of petrol or something other? to replace that is about an hour round trip from me tomorrow is there anyway i can test it to make sure it bust?

do you think it worth me replacing the fuel pump or can that be tested?

look what I found:
DNAs use a particularly annoying system that uses both a vacuum tap and an air-operated pump run from the crankcase.

The whole system is actually a continuous loop with fuel being pumped from and then back to the tank. The carb float takes what it needs with the rest being returned untouched.

Unfortunately the engine needs to run for it to work. If you ever run it out of petrol, or it leaks and gets air in it, it won't start for love nor money, unless you prime it first.

The only real way is to take the fuel pipes off the carb (mark them up first), get some silicone hose, a 100ml syringe. Attach your hose to the inlet on the carb and point the other hoses at the ground. Fill your syringe with petrol and use gravity to get it into the carb.

Now try to start the engine. If it fires, you should see fuel spitting out of the the intake pipe. Stop the engine. Then reconnect the hoses and open the fuel filler cap to let air escape.

Start again, there should be enough left in the carb to run the engine long enough for the air in the pipes to be forced out the tank and be filled with fresh petrol.

HTH

It's me that doesn't understand. I was completely wrong.
http://www.bikechatforums.com/viewtopic.php?t=187045 link to the conversation here;
So you need a syringe - not a new depression pump.
I have never heard anything like it. Apologies - I assumed you had a normal fuel delivery system. At least you know why it won't start now !
Good luck !

hi,

i have just had the same information of a mechanic that rang me back from last night, he informed me the system would be air locked,

i have looked at the link you have just given and my system is different to the 1 in the diagram my pump is under the tank, my issue is though i have no idea what pipe to remove what pipes the inlet can anyone help with this please.

hi guys,

i have uploaded a 2 photos of the bikes pipe work, can anyone tell me what pipes i need to take off and what pipes i need to suck,
really need help please as it xmas tomorrow and his bike still wont start,

From what I read above you need to take the inlet pipe (the one that would normally flow fuel from the pump) off the carb and use a 'syringe' to fill the float bowl. This should be enough to get the scooter running so that it will bleed the fuel system itself.

A good substitute for a 'syringe' is a washing up liquid bottle in my experience. So what you need is some fuel in a bottle or some such, a bit of pipe that fits the bottle and the carb inlet. Connect it up and make sure the carb is filled up with fuel.

Start the bike, it should run on the fuel you have put in the carb and prime the fuel system.

what pipe is the inlet pipe?

It's the top one in the second photo. I can see a huge air bubble in it. That is your problem right there. If you disconnect that one from the carb and then fill the carb directly with petrol via the inlet pipe of the carb - using either a syringe or Gemma's idea (make sure whatever you use it's dry & clean) - it should start. Then you need to do as the guy said in the other forum. The scoot will run as long as there's fuel in the bowl of the carb.

I can't find any pictures that make it real clear, trust me I've tried!

Trace it back. One of the fuel pipes from the carb will be the return to the tank. One will come from the vacuum tap (fuel tap). It is the one that starts life at the vacuum fuel tap and eventually gets to the carb that will be the inlet pipe.

Take that pipe off at the carb, put your own fuel pipe on and fill the float bowl. You can check you are doing it right by undoing the drain screw (lowest screw on carb at the bottom of the float bowl), if fuel is coming out of the drain screw, you are definitely getting fuel into the float bowl. So then tighten up the drain screw, fill the float bowl and try to start it.

when you say the top 1 do you mean the pipe round the back of the carb? the 1 clear 1 closest the rear wheel?

Pipe is as turbovetto says, posted without refreshing and didn't see reply.