Engine does not stay running

1972 JAGUAR XJ6
72,000 MILES • 6 CYL • 2WD • AUTOMATIC
Avatar
FWELCH
  • MEMBER
  • 14 POSTS
On my car it turns over just fine, it has spark now but seems to not be getting fuel. The fuel pump is working, I even disconnected the fuel line and checked the flow gas is flowing. I tried starter fluid and as long as the starter is engaged the engine acts like it's going to run but as soon as I let off the starter it shuts off immediately. What can the issue be?? I rebuilt the carburetors but still the same issue listed above.. Any suggestions??
Jul 10, 2021 at 9:53 PM
Advertisement
Avatar
KASEKENNY
  • Experienced Mechanic
  • 18,907 POSTS
Are you using an electric fuel pump? Is so, more than likely the pump has failed. I just dealt with this exact issue on a 1961 Austin that we replaced the mechanical pump with an electric pump. Basically the pump would turn on and build a small amount of pressure but it would not fill the bowl.

So what I would do is turn the pump on for 20 seconds and then shut it off and check the bowl to see if it is full. If it is not then your pump is the issue.

If you have an electric pump then you should have a filter between the tank and pump.

Unfortunately our manual does not have much on this vehicle so I am not positive how it is equipped but you have a fuel issue and I would think the pump is the issue.

Let me know what you find with this and we can go from there. Thanks
Jul 11, 2021 at 10:51 AM
Avatar
FWELCH
  • MEMBER
  • 14 POSTS
I replaced the fuel pump with a high pressure pump. The fuel is getting through too good. Fuel shooting out of both carburetor. I figured that would happen. I'll go back to the low pressure pump. Funny thing though, it almost started up. I'm wondering, does the 1972 have a crank position sensor and could that be an issue??
Jul 18, 2021 at 5:58 AM
Avatar
FWELCH
  • MEMBER
  • 14 POSTS
Oh, another question regarding the fuel pump. With the low pressure pump it was clicking when it comes on and operating. Is that normal for the low pressure fuel pump??
Jul 18, 2021 at 6:04 AM
Avatar
KASEKENNY
  • Experienced Mechanic
  • 18,907 POSTS
Sorry for the delay. Yes, you need a low pressure pump. No more than 8 PSI. Preferably a 4-7 PSI pump.

However, if you have a 5-8 PSI then that is fine as well.

As for the clicking noise, it depends on the make of the pump as this could be normal. However, it normally just makes a humming noise when it comes on but if there is a single click then I would not be overly concerned as they have a solenoid inside that turn the pump on.

Feel free to get a recording of this if you are still concerned or you think I am not understanding and that will help catch me up.

Thanks
Jul 19, 2021 at 11:54 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.