Engine cutting out problem resolved

[geez150]

If the vent valve can have vacuum pulled thru it, along with pressure too, its fine, do nothing Pete.

The problem is people do not understand that pressure that builds in the tank is by design to prevent vapor loss. Everyone freaks out that the cap blows off or it holds pressure, and old sleds never did this before.

The return elbow is not the reason for cutting out either like I said. If the orifice is too small in the elbow, all that would do is create a rich condition at idle and down low when the most fuel is getting returned to the tank as it is more restriction than the fuel regulator is all. It would create a high line fuel pressure and run rich, not cut out.

You seem very knowledgeable about the fuel system of these sleds. If one has too high of fuel pressure is there anything that can be adjusted by the dealer to alter the psi or is the regulator a one set point type of control?

 

[Hammer70]

You seem very knowledgeable about the fuel system of these sleds. If one has too high of fuel pressure is there anything that can be adjusted by the dealer to alter the psi or is the regulator a one set point type of control?

The regulator is non adjustable it is set from factory

 

[KnappAttack]

You seem very knowledgeable about the fuel system of these sleds. If one has too high of fuel pressure is there anything that can be adjusted by the dealer to alter the psi or is the regulator a one set point type of control?

The regulator should control the line pressure and it is fixed. It is also a rising rate design & non adjustable.

If the elbow is too small and restricted, it would become the regulator and pressure would rise until enough fuel is consumed thru the engine and the regulator takes control again with reduced fuel returning to the tank.

I guarantee you if the elbow was the restriction, you'd know it as the engine would basically flood from fuel pressure being too high at an idle. You smell a real rich condition and it would burn your eyes if the fuel pressure got too high and it ran that rich.

This elbow is not causing fuel pressure to be too high unless is has a casting flaw of some type, a faulty regulator could though.

 

[Hammer70]

The regulator should control the line pressure and it is fixed. It is also a rising rate design & non adjustable.

If the elbow is too small and restricted, it would become the regulator and pressure would rise until enough fuel is consumed thru the engine and the regulator takes control again with reduced fuel returning to the tank.

I guarantee you if the elbow was the restriction, you'd know it as the engine would basically flood from fuel pressure being too high at an idle. You smell a real rich condition and it would burn your eyes if the fuel pressure got too high and it ran that rich.

This elbow is not causing fuel pressure to be too high unless is has a casting flaw of some type, a faulty regulator could though.

How is the fuel pressure regulator controlled vacuum or electrical

 

[KnappAttack]

How is the fuel pressure regulator controlled vacuum or electrical

Boost raises fuel pressure on a 1:1 rising rate level.

 

[geez150]

Boost raises fuel pressure on a 1:1 rising rate level.

I'm assuming you are talking about boost made by the turbo. So if someone had a boost leak the fuel pressure would be on the lower side of things?

 

[KnappAttack]

I'm assuming you are talking about boost made by the turbo. So if someone had a boost leak the fuel pressure would be on the lower side of things?

Correct. The fuel pressure is self adjusting for the boost. For every 1# of boost increase, you'll have an added 1# of fuel pressure increase.