Engine won't start.

[Madmax82]

Hi,
I am having problems with my 420a, the engine will start and run with no problems around 20 times, than it will come the one time were it doesn't, the engine will crank but but it doesn't come on, there is no spark, ign is ok and it will take around 30min to start.
Please some advise.
THX

 

[Madmax82]

Well we fixed the issue, it was the engine relay, not the one for fuel pump, we replaced i and it fixed the issue.
M/T has 2 relays and A/T has 3.
When the relay starts failing all the positive power lines in the engine becomes negative and there is no spark, but the engine cranks as normal.