Check the check valve located at the inlet of the fuel pump for leaks. It sounds like the fuel accumulator has failed. get under car , remove fuel pukp and accumulator assembly. Remove fuel accumulator, drain unit. Shake unit, if it has fuel inside it has an internal leak and must be replaced. The engine heatsoak causes fuel to boil, the accumulator maintains pressure to prevent this issue.
A fuel accumulator for a 1986 Mercedes-Benz is a component designed to maintain consistent fuel pressure within the fuel system. It acts as a reservoir, storing excess fuel and ensuring a steady supply to the fuel injectors, particularly during high-demand situations. This helps improve engine performance, reduce fuel pump strain, and prevent vapor lock. Proper functioning of the fuel accumulator is essential for reliable engine operation in the vehicle.
You don't! Vw's use a CIS fuel injection system (CIS stands for Continuous Injection System), the fuel accumulator holds the fuel pressure when the car is off, so it can start right up when you crank the engine again, since fuel is right there at the nozzle tip of the fuel injectors.
If that is throttle body fuel injection, there is no fuel pump test port. You have to fabricate with some fittings and tap into the fuel line at the fuel filter.
You have to fabricate fittings to splice into the fuel line at the fuel filter so as to install a fuel pressure gauge. Not uncommon to do with older vehicles.
Park vehicle on level surface. Chock wheels, jack passenger side rear of unit and place on jackstand. Using 13mm socket remove the 4 nuts holding the fuel pump, fuel filter and accumulator bracket as a unit from the body. Lower the bracket, don't over stress the lines or wires. Loosen the 2 banjo fittings in the accumulator. Loosen the strap that holds the accumulator body to the bracket, 10mm. Maintain the same in and out relationship, install the accumulator. Install the banjo fittings, tighten to 6-9 footlbs. Run the engine to check for leaks. No leaks? Re-install the unit onto the body.
I don't want you to fabricate a lie.He could fabricate wonderful stories.
It doesn't have a test port. You have to fabricate fittings to tap into the fuel line at the fuel filter to connect a fuel pressure gauge. They probably sell a kit to do that but I made my own.
Could be bad compression, with a bad head this problem gets worse with higher temperatures. Hard starting at hot could be a failing ignition coil, does the engine miss under load at hot? It could also be a failed fuel pressure accumulator or fuel check valve. Scrooch under car, find the fuel accumulator ahead of rear wheels on passenger side. Next to the fuel pump (the noisy unit humming along during operation) there is a can with 2 lines going into it. It's smaller than a soup can. If the car has high miles I would just replace the accumulator as it will probably have failed in the 28year old car. If replacing the accumulator doesn't help, replace the check valve on the fuel pump.
A mechanical, or electrical accumulator???
Accumulator is what the British call a capacitor.
Fabricate engin mounts, install bell housing adapter, replace computer, fabricate exhaust system, replace fuel pump, fabricate mount for larger radiator, and the list goes on. Take it from someone who has done a swap, if you need a v8 just buy a cj with a 304.