Fuel System Help

[The Outsider]

Sounds like ralph is winding u up lol

starter motor windings?

[JETURBO]

^^^ this ^^^

[xr6thsveta]

How long should the rail hold pressure after turning it off ?

[xr6thsveta]

I would, rather I do, have check valves for my setup (twin 044's). Just means an easier start when car is stopped for time, rail will hold pressure and your pumps will live longer so I was told.

As in my last post, how long should the fuel rail hold pressure after stopping engine ? Is it different with each car ?Would be good to know!!! Cheers

Edited 19/01/13 03:42 AM by xr6thsveta

[KPM Motorsport]

'

Yes you do need them to keep residual presssure.

Give me a call and I can supply you 2 genuine 044 Bosch check valves No charge.

[bossmang]

at what point do you need one of these?

[KPM Motorsport]

You always need a non return check valve. This keeps pressure in your fuel line when the engine is off/pump not running.

It is a standard item on all cars. It is usually part of the pump itself.

When people replace there pumps and /or add a Bosch 044 , is when you need the extra check valve. The Bosck 044 does not internally house a check valve . Bosch have an external screw in valve for this pump that should be always used.

It is not a perfrmance item , rather a drivabilty item. With residual pressure in your fuel line , you will have immediate fuel supply on start up.

This means no extra cranking to fill the fuel lines before it reaches the engine.

It serves another purpoes of preventing fuel vaporisation in your fuel lines on hot days restarts.

[xr6thsveta]

If you have a check valve in the line and it still looses pressure at the fuel rail, what can be the problem? Regulator leaking when stopped? My rail has no pressure inside an hour after stopping, and it cranks for ages before firing up after about sitting for about ten minutes. Going to get the tune looked at but just looking at all options, cheers

[Kosij]

I would GUESS problem would be in the tune one tune I had took 10 cranks to start, next tune it

Fired straight away!

[xr6thsveta]

It was good after first tune, but after getting CAT taken out, it started having the long cranking problem. Was already booked in for retune for the cat removal but tuner could not fix it (no issues while on the dyno).

Could the exhaust shop who removed the CAT have got a power spike which has caused the issue?. Its been to Ford and they checked for codes, cleaned the T/B and told me it was fixed. Still the same.

My tuner has gone, shifted to Aussie (no idea why LOL) and Im having trouble getting hold of the new guy who took over, to get a copy of my VCM tune (he has never tuned an XR6T) so im trying everything now short of getting a new tune $1300.....

cheers

Edited 20/01/13 07:37 AM by xr6thsveta