Uh slow down GlueBall:
Diesel fuel ignites due to heat and pressure from a 20-1 compression ratio.
You are indeed rigth that jet fuel could ignite under the same conditions: Inside a diesel engine that is.
Even if your jet had clogged vents and ram-air built up pressure inside the fuel tanks,
(Or pressure build-up from clogged vent and return fuel being pumped into tank)
uh, the wing would most likely rupture long before there was enough pressure to cause ignition from compression.
I would guess the fuel tanks could only take a couple of PSI before failure, the burn chamber in a diesel probably has several hundred PSI. (Or thousands or millions: Where is the engineers when ya need 'em??)
As far as what happened to TWA 800, the more I learn about that accident, the less sure I become: Fuel tank problem, missile, or some other factor. (Fuselage fatigue, wing spar snapped, engine explosion, bomb, whatever)