On turning on the ignition on a visit to my mum there was a load banging noise from the rear of the freelander( 2003 td4 ). Started up and ran fine for 30 miles and then started intermittently going into what I think is known as limp home mode especially when going up an incline. Almost made it home when management light came on and I parked up in a very convenient layby. Wouldn't restart.

Recovered to a garage and had new rear wheel arch pump fitted & filter.
Went to collect it didn't start quite as nicely getting progressively worse over next three days when foot down and lots of cranks just got it started to get me home. Wouldn't start again.

I can hear a sort of cavitating whooshing noise from the region of the hp pump on prime ( first click on key ) so I thought drawing in air maybe from tank. Pulled up carpet and undid connectors to tank and attached temporary hoses to feed and return. Switched on to prime and had fuel delivered to both inlet and return pipes ????????????? Went with one gallon of fuel and came away with two before I realised what was happening.

So two questions 1. Air whooshing noise in hp pump
2. Fuel coming back inlet pipe to pump and where's it drawing from.

Utterly confused
Thanks