924Board.org

Tallgraham · Joined: 17 May 2020 Posts: 1 Location: Devon

Hi all
I have a 82 924N/A that I bought as a wreck and have got it back on the road. The fuel system had been left dry for years and after much removing, cleaning it's all up and running, new Injectors, accumulator, pump but I have a bizzare issue...
Hot start, tried everything, connected up fuel pressure gauge to check pressures and everything is within spec, and it'll fire hot every time. Disconnect the gauge and reconnect the fuel lines, won't start hot...
Is the gauge acting like an accumulator? I cannot figure out where this issue is now!
Thanks in advance.

Raize · Joined: 18 Sep 2013 Posts: 184 Location: Scotland

Make very certain that the connections where the gauge goes aren't making tiny leaks when you reconnect them. They are very difficult to spot, so maybe use a tissue and see if it gets wet at all. Even a truly miniscule leak in the control pressure circuit will be enough to mess up your hot start.

I had cold start problems once with a gauge on that went away when I removed it. I believe it was leaking a very small amount and allowing air bubbles to form in the control pressure lines which then messed up the control pressure.