X300 4.0 random start issue
#21
#22
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Excess current draw weakens the relay. Could be just the relay as the blue ones are known to be troublesome, but keep a sharp eye out..if you blow another relay or the fuel pump fuse, you'll probably want to start planning a fuel-pump renewal.
One of my 96's refused to start and I found this in the fuel pump relay slot:
![Name: IMG_20160528_215829084_zps9gwjiciw.jpg
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Size: 195.8 KB](https://www.jaguarforums.com/forum/attachments/xj-xj6-xjr6-x300-26/150394d1501200872-x300-4-0-random-start-issue-img_20160528_215829084_zps9gwjiciw.jpg)
![Name: IMG_20160528_215858026_zpsub6qxjew.jpg
Views: 374
Size: 166.4 KB](https://www.jaguarforums.com/forum/attachments/xj-xj6-xjr6-x300-26/150395d1501200872-x300-4-0-random-start-issue-img_20160528_215858026_zpsub6qxjew.jpg)
Replaced it and fired right up and pulled into the shop...but it's a kid's car, so rather than trying to milk the last bits of life out of the pump, I just changed it out....had one on-hand anyway. It's been said fuel pump failure and crank position sensor failures are fairly common on the X300 around 100,000 miles. This one was at 108k, I think. On the other hand, my 95 is at 211k and on the original pump and CKPS.
One of my 96's refused to start and I found this in the fuel pump relay slot:
![Name: IMG_20160528_215829084_zps9gwjiciw.jpg
Views: 333
Size: 195.8 KB](https://www.jaguarforums.com/forum/attachments/xj-xj6-xjr6-x300-26/150394d1501200872-x300-4-0-random-start-issue-img_20160528_215829084_zps9gwjiciw.jpg)
![Name: IMG_20160528_215858026_zpsub6qxjew.jpg
Views: 374
Size: 166.4 KB](https://www.jaguarforums.com/forum/attachments/xj-xj6-xjr6-x300-26/150395d1501200872-x300-4-0-random-start-issue-img_20160528_215858026_zpsub6qxjew.jpg)
Replaced it and fired right up and pulled into the shop...but it's a kid's car, so rather than trying to milk the last bits of life out of the pump, I just changed it out....had one on-hand anyway. It's been said fuel pump failure and crank position sensor failures are fairly common on the X300 around 100,000 miles. This one was at 108k, I think. On the other hand, my 95 is at 211k and on the original pump and CKPS.
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Don B (04-02-2017)
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