poor starting

The derv is taking her time to start in the mornings.



its not particularly cold but is taking around 4 to 5 seconds of cranking before she fires. I know at least one plug is out possibly two, but i know 2 are fine as i replaced them recently thinking that may be the problem but has made no difference (also checked there was power to them).



The other night after work parked all day on a backward slope she wouldn't start at all, and battery was about flat when i gave the priming bulb a few pumps till hard and away she finally went so have tightened all the fuel pipe clips up.



any ideas what to try next as she used to fire after 2 to 3 seconds whatever the temp.

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