Hi This is pics of wiring for hooking up a 12V facet fuel pump I use for assisting lift pump to pull WVO up to the IP.
DISCONNECT BATTERY AFTER YOU FIND YOUR HOT WIRE FROM FUSE BOX.

pic 1) Is just a hot wire coming out of the fuse box. Any one that works once the key is ON.
This wire connects to the relay switch.

pic # 2) Seperate wire connects to "this thing" near the battery; the middle screw inside this clip holds it in.
Ran from here to a relay switch. IMPORTANT TO INSTALL A FUSE LINK IN THIS WIRE. 12w FUSE SHOULD DO.
A relay has 4 conections. 1 for this hot wire from the little box next to the battery. 2. from the wire from the fuse box. 3 for power to the hot wire of your new pump. 4 to a ground. (mine is in pic 3 on the air intake screw up front.)

pic 3) Is a simple relay switch from the AP store; connected to my coolant resevoir. (follow directions for connections on the switch box; or see above...)

pic 4) Is the pump mounted under the rear pass side; It is mounted to the frame here with 2 fat screws into already existing holes on this support frame. When you look under here you will see lots of these holes to choose from. I also grounded to the frame from the pump.

pic 5....just the front end of an ol' 300D with it's proud HIgh mileage badge!!!!

Attached Thumbnails

         

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'87 924S
'81 280SEL

Sold ->

81 300SD -
93 300E w/ 3.2
85 300D-
79 300SD
82 300CD
83 300CD - CA
87 190E 5 spd
87 Porsche 924S

"..I'll take a simple "C" to "G" and feel brand new about it..."

Thanks for all the feedback. And btw the pump is installed next to the fuel tank. It connects to the fuel hose after the screen filter, where the fuel (WVO) leaves the tank and heads towards the injectors......

In case that wasn't clear to anyone..........TK

__________________
'87 924S
'81 280SEL

Sold ->

81 300SD -
93 300E w/ 3.2
85 300D-
79 300SD
82 300CD
83 300CD - CA
87 190E 5 spd
87 Porsche 924S

"..I'll take a simple "C" to "G" and feel brand new about it..."

Looks interesting and is a helpful writeup for those needing to install a pump (or another relay-operated item), as for me, I can't find/use any veg oil. So instead I am burning diesel like no tomorrow....(traveled about 500 miles in the past week ) I must say, after running on that soy blend, regular diesel has way more "umph" in it and the power on the freeway (which is most of my driving now) is great to have. Currently I am burning about 80 gallons of diesel a month

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

so is there any danger of over powering the ip....

just a 15 dollar inline electric fuel pump....

Out of curiosity, what would be the advantage of putting the pump on a relay? Is it only so the pump is running on its own circuit? Thanks.

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1989 300E 144K

It's a layer of protection and a good idea.
Most circuits that require a lot of power use relays. Horns, AC, Glowplugs, etc...

It should be mentioned that the relay should be able to handle constant power. The first relay the guy at Napa sold me was a horn relay. After checking I found it was only rated for 20 seconds.
I went back and got an AC relay.

Adding the pump is probably a good idea. I did on mine. But you don't really have to. If your lift pump can't handle the vegetable oil then your not thinning enough. The oil should mimic the viscosity of diesel fuel.

It's not so much a problem on our earlier MB's as it is in some other vehicles.

Danny

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1984 300SD Turbo Diesel 150,000 miles

OBK member #23

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