It begins with... - Page 2 - PeachParts Mercedes-Benz Forum

Tomguy · #16 02-26-2007, 11:20 PM

Quote:

Originally Posted by arootbeer

Can anybody tell me what the two vertical pipes in the 3rd picture are for?

Drains! assuming those are on the firewall. Cowl drains, to be more specific. They prevent water from going into your fan.

arootbeer · #17 02-26-2007, 11:28 PM

Perfect...what are the plastic bulbs for? just to diffuse the water as it's pouring down over the engine?

Tomguy · #18 02-26-2007, 11:31 PM

Those RUBBER pieces are valves to keep the water from going the wrong way. If they're hard enough for you to believe them plastic, they are probably doing more harm than good on your vehicle and not opening.

arootbeer · #19 02-26-2007, 11:35 PM

Haha...they're basically rigid. So, to keep water from going into the drains, but allow it to come out from above? Sounds reasonable.

Anyone want to take a shot at the fueling questions?

wbain5280 · #20 02-27-2007, 01:54 AM

I want to put a twincam M110 in my 220S too. I saw a couple in the junkyard but they have parts picked off them andthey have some rusty parts on them. Maybe I should go with an M103 from a 300E. I have one in my 300SE so I'm familiar with them.

cth350 · #21 02-27-2007, 12:11 PM

I would swap the fuel lines. Pipe diameter has an impact of pressure and the amount of work the pump has to do to move fuel volume. A few rebends of the pipes should not be terribly difficult.

-CTH

arootbeer · #22 02-27-2007, 10:47 PM

Spent a bit of time with the 280 tonight. I hooked up the battery, checked that there were no collisions in the engine compartment, and turned it over a couple of times. It turned eagerly, with no odd noises. The headlights wouldn't come on, but then I remembered that they're physically not there

I didn't hook in the new fuel pump yet, per the previous owner's noting that the car seems to burn out new fuel pumps in about 10 seconds. Anybody got any idea why that might be? I thought it might be because the airflow sensor had failed closed and was causing the fuel pump to run when the engine was turned off, but with the key in the "ON" position I didn't get any voltage at the fuel pump leads. I did note that the fuel lines to the CIS system in the 280 are the same size as the lines on the 230.

I also took a look under the 230, and noticed that it has an in-tank fuel pump. Anybody know what the fuel pressure rating of that pump might be?

Mark DiSilvestro · #23 02-28-2007, 12:14 AM

Quote:

Originally Posted by arootbeer

Spent a bit of time with the 280 tonight. I hooked up the battery, checked that there were no collisions in the engine compartment, and turned it over a couple of times. It turned eagerly, with no odd noises. The headlights wouldn't come on, but then I remembered that they're physically not there

I didn't hook in the new fuel pump yet, per the previous owner's noting that the car seems to burn out new fuel pumps in about 10 seconds. Anybody got any idea why that might be? I thought it might be because the airflow sensor had failed closed and was causing the fuel pump to run when the engine was turned off, but with the key in the "ON" position I didn't get any voltage at the fuel pump leads. I did note that the fuel lines to the CIS system in the 280 are the same size as the lines on the 230.

I also took a look under the 230, and noticed that it has an in-tank fuel pump. Anybody know what the fuel pressure rating of that pump might be?

Do you mean an 'in-line' fuel pump? Carbureted Mercedes came with an engine-mounted mechanical pump.
So far as I know, no 230 came factory-equipped with an in-tank fuel pump. Or did you mean the 280? And if there is a pump inside that tank, how could you 'notice' it?

Happy Motoring, Mark

arootbeer · #24 02-28-2007, 01:02 AM

So the lines coming to and from the tank on the 230 are just that, supply lines? I guess that makes sense, but I just saw the lines leaving the tank and figured there was a fuel pump in the tank (although now that you mention it, I do recall unbolting the fuel lines from the fuel pump when we removed the engine).

Thanks for the clarification/reminder. Having my choice of where to locate the fuel pump for the 2.8 will certainly make the project easier.

t walgamuth · #25 02-28-2007, 06:05 AM

i have never heard of a fuel pump in the tank of a benz of this era at least.

tom w

cth350 · #26 02-28-2007, 06:46 AM

The supply line to the stock pump should be short with the pump mounted roughly at the plane of the tank.

As long as the pump is getting 12v and the circuit is fused correctly there is no reason for the pump to die "after a few seconds". However, there is a fuel cut-off circuit that turns the pump off after a few seconds if the motor doesn't start running.

As long as gas flows freely from the tank, all should be well. In your situation, I'd clamp off the line from the tank on the 280 and have the pump draw fuel from a gas can and return it to the same place.

-CTH

Mark DiSilvestro · #27 02-28-2007, 08:03 AM

Quote:

Originally Posted by arootbeer

So the lines coming to and from the tank on the 230 are just that, supply lines? I guess that makes sense, but I just saw the lines leaving the tank and figured there was a fuel pump in the tank (although now that you mention it, I do recall unbolting the fuel lines from the fuel pump when we removed the engine).

Thanks for the clarification/reminder. Having my choice of where to locate the fuel pump for the 2.8 will certainly make the project easier.

The carbed cars have a fuel return valve fitted to the front carburetor. The second line at the tank is the fuel return connection. Make sure you connect the FI pump's fuel supply to the correct line.

Happy Motoring, Mark

arootbeer · #28 03-07-2007, 11:58 PM

In case anybody's interested, I'm selling the 15" bundts off the car (all 5 of 'em). Link is in the classifieds.

Matt L · #29 03-08-2007, 12:05 AM

Quote:

Originally Posted by arootbeer

That's the main reason I picked it up...I'm going to go megasquirt after I get the car running, and I didn't want to have to source manifolds, etc.

Can you get electrically-operated injectors which will mount in place of the K-jet injectors? I've never seen such a thing, but they might exist.

If not, you have to have the manifold machined. However, this does seem quite possible, and would probably be worth it. Especially if your fuel distributor is not in perfect condition; those things are expensive.