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hopefully this will work for users..shows two engine electrical diagrams one of which is the systems and the other is the ignition..

I will repeat the tests using a jumper to energize the pumps and prove whether its the pumps or wiring..possibly a funky relay..

These are complicated cars but each part is simple and if you correctly pursue each issue theyre wonderful..What seems like gremlins are reduced to a bad ground or corroded contacts or something simple and then youre good again! When I got this it was full of mice, had sparkplugs underwater in the cylinder head and rocks piled on the intake manifold I assume by squirrels! But it had a recent cylinder head gasket which was done poorly by Mercedes starmark..one bolt was not torqued at all and the gasket leaaked.They had ground only the intake valves and exhaust valve guides were totally gone..Now its all up to spec...But all the hoses were new along with the brake booster and a ton of other expensive parts..So its nearly 100%.

What else could one get for under 5k that compares in terms of comfort and quality and performance!

Its only with forums like this and online parts suppliers with occassional dealer help we can pull these old cars together but well worth it!