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Number one on the "Common Failure Modes" list regarding DeLorean hot start issues!
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1 - Fuel Accumulator P/N K100519: The fuel accumulator is a pressure reservoir located between the fuel pump and the engine. Internally it is a rubber diaphragm over a spring.
Due to the use of the rubber diaphragm, the fuel accumulator is subject to deterioration over time. The life of an accumulator will depend on the formulation of the gasoline used and the presence of stale fuel for long periods of time. The life of an accumulator can be from 10 to 20 years under normal circumstances, but as short as a few years if the car is parked for a long period of time with oxygenated (ethanol) fuels.
The accumulator will typically fail gradually. If you notice the car beginning to be hard to start when hot, initially after 30 minutes but with the period of time getting shorter over time, this is the likely suspect. It is also the likely suspect if the original unit is still in the car! An original fuel accumulator will typically have hard black hoses attached, but it's common for the black coating to have deteriorated and be falling off, exposing the cloth covering underneath. This is usually an indication of an original accumulator but it's possible that a prior owner replaced the accumulator without replacing the hoses.
The fuel accumulator is physically located inside the center section of the frame, between the gearshift lever and the transmission. It is accessed through an oval hole underneath the car. The replacement part includes an instruction sheet on how to best replace the unit.
CAUTION: The following tests will expose you to liquid fuel. FIRE HAZARD/FLAMMABLE! Do these at your own risk in a well ventilated area. The most conclusive test of the accumulator is to disconnect the hose from the end of the accumulator that faces the rear of the car. Plug the hose. Connect a second section of 1/4" hose to the nipple on the accumulator and direct it into a suitable container. Start the engine. After an initial spurt of fuel, no fuel should flow from the accumulator. If it does, the internal diaphragm has failed.
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