Hi Guys, I need help. Just bought this beautiful XJ6. The fuel pump was not working. Ended up putting a jump wire on the red diode next to the fuel pump relays and it fired right up. Took it out on the road and it ran smooth like a new engine. After about a mile or 2 it started to bog down when I gave it too much gas, then got worse and worse until I couldn't gave it any gas off idle. But if I pull over and shut it off for a minute or less it fires right up and runs smooth again, then after a mile or 2 stars doing the same thing.I would appreciate any idea you might have, Thanks Dave ,

 

could be a few things, sounds like something over heating & the fuel pump can't keep up the pressure....or main relay for fuel pump failing....or ignition coil over heating....and so it begins.........

 

Does it do it on both fuel tanks.? A partial blockage of the fuel filter in the tank will end up with the pump unable to get fuel out of the tank.
Being stopped for a while allows fuel to percolate through the filter. Then it can start and run again.

 

Remove the fuel filter and empty the contents into a clean jar. What you see will dictate your next steps.

Cheers
DD

 

Im only running off 1 tank the swith valve is not working. I took the filter off yesterday, brown gas came out of the inlet. When I blue into the inlet clear gas came out. I put a new filter on and it is doing the same thing.

 

I don't quite understand.

"Doing the same thing" = brown gas comes out? Or clear gas comes out?

Brown gas = rusty gas tanks. Common.

You may have other problems with respect to engine performance but fixing this issue has to be the first step.

Cheers
DD

 

Daves
The filter I am talking about is inside the fuel tank and is not repeat not the in line fuel filter after the pump.
At the bottom of the rear fender there should be an access panel with a rubber bung.
Remove that bung for access to the small tank drain bung. Drain the tank.
Then there is a larger bung which can be removed which allows access to the filter which fits over the fuel pick up pipe.
If this filter is partially blocked the fuel pump cannot pull adequate fuel to keep the engine running.
After sitting for a while enough fuel may dribble through the filter to get started and run for a short distance.
NOTE Doug's advice re brown gas and a rusty tank. Your in-tank filter is probably getting clogged with rust.
You may also need to fit fuel filters between the tanks and the fuel pump.
The fuel pump has very strong permanent magnets which will pick up any rust particles and eventually jam.