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Matt, Engineer
Category: Jaguar
Satisfied Customers: 389
Experience:  Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
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We changed fuel pumps,checked the fuel pressure and it will

Customer Question

We changed fuel pumps,checked the fuel pressure and it will start but won't stay running. Is there a regulator that let's the fuel go back to the tank,or is there anelectronic relay that could cause this?
Submitted: 1 year ago.
Category: Jaguar
Expert:  Derek Werner replied 1 year ago.

I am sorry to hear you are still having starting problems. What is the fuel pressure at now? Your vehicle has 2 fuel pumps primary and secondary pumps. When the secondary in tank pump is replaced you need to be careful not to drop any dirt in the tank and the filter should be replaced.

The fuel pressure regulator is on the back of the fuel rail. A failed regulator can cause no start but it is not common. The fuel pressure regulator will have a vacuum line connected to it. Pull the vac line and make sure its not leaking fuel out of this port. The regulator is controlled by engine vacuum.

Expert:  Derek Werner replied 1 year ago.

Also how long does the vehicle stay running? can you get it to run by spraying brake clean into the intake.