Maybe the hose is all buggered and is collapsing when fuel is pumped
through it (here I am assuming the pump is sucking it from the tank) or
has crap in it from sitting so long. The filter aspect would also be a
good place to start. How hard would it be to get a mity-vac on a fuel
line and see if you can pump some (sucking?) from the tank? Take along
some generic fuel line, run it from the tank vicinity to the fuel pump
and see if you can bypass the line? It most definitely sounds like a
fuel starvation issue of some sort. I had a lawnmower do that, ended up
cleaning the whole fuel system and carb to get it to run right.
I wonder too if the tank has gotten rusty from sitting in a humid
environment, using crap ethanol fuel, etc. and that has clogged the filter?
--R (no expert on Benz vergassers)
On 7/21/14 5:37 PM, Dan Penoff via Mercedes wrote:
Finally heard back from the owner. Here's what he tells me:
He got the car from the original owner. It had been parked for a couple of
years after being run out of fuel. Wouldn't start or run when he got it.
He replaced the fuel pump and filter and put fresh fuel in the tank. Fuel pump
builds up pressure and turns off. Car will start and idle, but when you
attempt to drive (load) the engine, it dies.
He thinks the fuel strainer may be clogged up, but isn't interested in putting any more
time into it. He says the hose from the strainer to the pump looks a little rough, and
he's wondering if there might be some air leaks there. He got the car from the original
owner either for free or very little from what I can tell, so it has just been a project
to tinker with. He doesn't know MBs and seems obsessed about the original owner paying
"more than $60,000 for it new in 1984!!"
This does not seem to be an effort to pump up the price, just some sort of awe
that a car would have cost that much in the day.
I was going to run over to Harbor Freight and pick up a fuel pressure tester,
but theirs says it doesn't work on Bosch or CIS-Jetronic. Is this the case?
http://www.harborfreight.com/fuel-injection-pump-tester-92699.html
It definitely sounds like a fuel delivery issue, as he says as they have
tinkered with it there have been times when it could be driven at 20-30 MPH
without a problem, then after being parked for a day it wouldn't do more than
idle, that is, when loaded it would stumble and miss. I'm still going to take
a jumper for the fuel pump relay, but I don't think that's the issue.
Interior is said to be very good, with the stitching on the top of the back
seat coming loose (nothing new there) and the exterior having a nickel-sized
spot of rust bubble in front of the passenger side rear wheel well.
Let's hear those ideas, guys! I nee some direction so I'll know what to look
for when I get up there tomorrow night!
Thanks!
Dan
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