1998 Jaguar XJ8 Cold Start Flooding

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KARAWARA88
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  • 1 POST
Hello can anyone help me before I set fire to my Jag :x

Its a 1998 XJ8 3.2 it recently had a head gasket change and ever since then I have had a problem starting it in the morning, the car will start then cut out, after which it will not start due to engine being flooded, I have to remove the fuel pump fuse, start the car let it burn off fuel, then put fuse back in and it will start on turn of the key.

Any ideas please, my only thought is to find the fuel pump cable and install a switch which will allow me turn off the fuel pump.

One other thing, when I do start the car I get a really strong smell of fuel.
Jan 23, 2006 at 11:32 AM
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2CARPRO JACK
  • ✓Experienced Mechanic
  • 11,533 POSTS
check the fuel pressure regulator, sometimes if the car backfires it will pop the reg and dump raw fuel into the engine
Jan 24, 2006 at 9:32 AM
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FSTRANGER302
  • ✓Experienced Mechanic
  • 117 POSTS
[quote:da6e226ef8="karawara88"]Hello can anyone help me before I set fire to my Jag :x

Its a 1998 XJ8 3.2 it recently had a head gasket change and ever since then I have had a problem starting it in the morning, the car will start then cut out, after which it will not start due to engine being flooded, I have to remove the fuel pump fuse, start the car let it burn off fuel, then put fuse back in and it will start on turn of the key.

Any ideas please, my only thought is to find the fuel pump cable and install a switch which will allow me turn off the fuel pump.

One other thing, when I do start the car I get a really strong smell of fuel.[/quote:da6e226ef8]

do you know what the fuel pressure is. when the car starts cold is should be around 35 to 40 psi then come down to 35 at idle. if it is higher it is possibe for the fuel pressure regulator is bad let me know if it helps.
Nov 16, 2007 at 11:08 AM

Suggested Repair

Check fuel pressure and the fuel pressure regulator. Cold-start pressure should be about 35-40 psi, then about 35 psi at idle. If pressure is high, or if a backfire damaged the regulator, replace the fuel pressure regulator, which can dump raw fuel into the engine and cause flooding and a strong fuel smell.

Conversation Summary

The owner of a 1998 Jaguar XJ8 3.2 reports cold-start flooding after a head gasket replacement: the engine starts, then stalls, and will not restart until the fuel pump fuse is removed so excess fuel can burn off. A strong fuel smell is also present. Experts recommend measuring fuel pressure and checking the fuel pressure regulator; expected pressure is roughly 35-40 psi on a cold start, falling to about 35 psi at idle. High pressure or a regulator damaged by a backfire can dump raw fuel into the engine.

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