Nick Heidfeld was slowed by reliability problems on Thursday during practice for the Monaco Grand Prix, the fifth round in the 2007 FIA Formula 1 World Championship.

The German was third fastest in the opening session but plummeted down the order in the afternoon and ended up 14th quickest in his BMW Sauber F1.07 after fuel pressure issues.

Despite that though, the German remained upbeat and was pleased with his preparations: "My lap times don't look good, but it isn't that bad. I had problems with the fuel pressure and, of course, when the engine cuts out it costs time," he explained.

"Apart from this both sessions went well, and in the morning the track had a surprisingly high amount of grip. Today we have tested both tyre compounds properly. For the race it is not only important to get a good grid position, especially because overtaking is so difficult, but also the right strategy is extremely important. Another factor for the strategy is the new safety car rule. There is a higher probability of the safety car coming out here than elsewhere."

Robert Kubica meanwhile had no issues in the sister car and ended up eighth in the first practice session and seventh in the second. The Pole conceded that while it was tough to begin with the car did come to him as the day progressed.

"It is obviously a lot of fun to drive here in Monaco. The sessions were difficult for us to start with and initially I really wasn't happy with the car," said Kubica.

"But step by step we started to find a direction and with the track rubbering in, the car seemed to just go better and better. We made our improvements with mechanical and aero changes - and I am quite pleased with where we ended up. I think we can have a good weekend here."



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