Trying to get my Vogue 50 started after many years (4.6gems). Turns over fine but no fuel getting to fuel rail (Schrader valve pushed and no fuel / pressure). Disconnected fuel pipe at bulkhead, nothing). Fuse checked and fine, relay checked and working fine. Inertia switch checked and power going to it. The question is how far back can I test the system before having to cut a hole in the floor? I haven't checked the fuel filter as it looks original and I don't want to damage threads. Are there any other obviouse checks? 'Working fine when parked up" LPG system fitted and 'petrol' selected. Plenty of fresh fuel in tank. No obviouse sound from pump but can you actually hear it from inside?