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  #1  
Old 12-20-2012, 08:47 PM
Turbo Diesel 300SD Ky
 
Join Date: Dec 2006
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anyone with an electric fuel pump installed in their 300sd?

Kent over at Mercedes Source recommends a Walpro unit.

Am wondering about owners' experiences?
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  #2  
Old 12-23-2012, 02:03 PM
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Quote:
Originally Posted by Cejpat View Post
Kent over at Mercedes Source recommends a Walpro unit.

Am wondering about owners' experiences?
I removed the mechanical lift pump so I can use the cavity to return oil to the crankcase from the centrifuge oil filter and replaced it with an 10-15 psi electric fuel pump. Works great, this is on a 1984 300D.
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  #3  
Old 12-24-2012, 03:15 PM
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I had one to push diesel,and veggie.Lost a contract don't have money to replace a new one
Though mine lasted 1 year,the Walbro unit break down also.There only one pump built for veggie and its a FASS
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  #4  
Old 12-28-2012, 09:15 PM
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Carter

I use a Carter electric pump that is mounted in the truck. I think it's rated at 18psi. Works great. Took me a while to find a good pre filter. The paper filters had a tendency to collapse and restrict flow.

I used the small 100 micron pre-filter from this site. Works great and is can be back flushed to clean.

RobbMc Performance Products - Fuel Filters

I have an 82 300SD
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  #5  
Old 12-30-2012, 08:59 AM
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Location: Albuquerque, NM
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Ford HFCU working very well

I am using a Ford horizontal fuel conditioning unit (HFCU). I found a few at the local scrap yard for 5 bucks ea. This is the fuel pump found on Ford Powerstroke 6.0 trucks. This unit is nice because it comes with a 10 micron primary filter, a thermostatically controlled fuel heater, a pressure regulator, and a drain plug. It is designed to deliver 50-60 psi, but works just as well at lower pressures. The unit is quiet and draws about 3 amps.

t
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  #6  
Old 12-30-2012, 01:13 PM
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Is there an advantage of using one for pump diesel?
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  #7  
Old 01-02-2013, 08:30 AM
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An electric pump makes priming the lines a breeze
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  #8  
Old 01-03-2013, 05:04 PM
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Quote:
Originally Posted by kestreltom View Post
I am using a Ford horizontal fuel conditioning unit (HFCU). I found a few at the local scrap yard for 5 bucks ea. This is the fuel pump found on Ford Powerstroke 6.0 trucks. This unit is nice because it comes with a 10 micron primary filter, a thermostatically controlled fuel heater, a pressure regulator, and a drain plug. It is designed to deliver 50-60 psi, but works just as well at lower pressures. The unit is quiet and draws about 3 amps.

t
this i find very interesting.....so all i have to do is pull such a unit at the pick and pull yard, and hook up fuel lines and 12 volts + mount it, or is it more complicated than that ??

like i said, highly interesting...

i would like to more...
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  #9  
Old 01-03-2013, 08:10 PM
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Quote:
Originally Posted by BenzDieselTuner View Post
this i find very interesting.....so all i have to do is pull such a unit at the pick and pull yard, and hook up fuel lines and 12 volts + mount it, or is it more complicated than that ??

like i said, highly interesting...

i would like to more...
That sounds about right for a fuel pump
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  #10  
Old 01-06-2013, 08:38 PM
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Most Walbro "external" fuel pumps I know of are for higher pressure fuel injection ~55 psig. They will work at lower pressure, but much more flow than needed. Biggest disadvantage is they need a regulator and return line to the tank.

All you should need is a simple "carburetor" type fuel pump. They need no regulator nor return line and can run all day dead-headed. Most output ~6 psi, but you can get special racing types ones up to 15 psi (Holley blue pump). Some make a racket if you mount on a rear frame rail. I would try to mount in the engine bay, below the supply tube. There is a small one on ebay ~$35 that says "gas or diesel". For the most flow, get a radial vane type, like Holley or Carter.

Edit -
A few flaws above, that were pointed out in a PM by a reader. There is already a 30 psi regulator (or relief) valve built into the fuel plumbing, so any electric EFI fuel pump could use that. They won't be hurt by running at lower than normal output pressure and unlikely that diesel fuel would hurt one. Indeed, it might like the better lubrication. The Mercedes spec is 12 psi minimum from the lift pump to the injection pump, so not all basic carburetor type electric pumps would work. I know the Holley Blue Pump (radial vane) can be run at 20 psi with the larger bypass spring they offer since I used one for years to supply a Holley Pro-jection TBI on one of my classic gas cars. However, EFI pumps are smaller and have become even cheaper, so might be the way to go in replacing the mechanical lift pump.

There are 3 external EFI pump designs I know of:
Bosch for European cars - a bit hard to plumb w/ 1/2"D inlet and banjo fitting outlet, plus largest diameter
Ford truck type (80's & 90's V-8) - cheapest (<$50), only 5/16" tube fittings that I have seen
Walbro - similar size to Ford but 2x cost, higher volume, multitude of scew-in fittings available and mounting hardware

Last edited by BillGrissom; 01-08-2013 at 02:44 PM.
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  #11  
Old 01-12-2013, 03:18 PM
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Ford HFCU working very well

Quote:
Originally Posted by BenzDieselTuner View Post
this i find very interesting.....so all i have to do is pull such a unit at the pick and pull yard, and hook up fuel lines and 12 volts + mount it, or is it more complicated than that ??

like i said, highly interesting...

i would like to more...
Hello,
The pump is called the HFCM, not the HFCU as I stated earlier.
I found the units cheap and local. I have seen them on ebay for over $400.00 - so you go with what you can find for a reasonable amount of $. If you have access to these cheap then try one. I took mine apart, cleaned it and made sure that the copper leads to the fuel pump on the inside of the pump were making good contact. I am using a length of 5/16" fuel line to connect it to both the supply and return lines. There are four nipples on this unit for main fuel in/out and return in/out.
Google "powerstroke 6.0 hfcm" for more info.
Here is a link to a diagram of the internal components and fuel flow.
275flow3.jpg photo by LowFlying7Three | Photobucket
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  #12  
Old 01-16-2013, 08:37 PM
winmutt's Avatar
85 300D 4spd+tow+h4
 
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Any why would you need an electric pump outside of bleeding lines which isnt that hard either? I mean, I know why you would, but I would be surprised if anyone in here really needed it.
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  #13  
Old 01-17-2013, 11:54 AM
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Location: Albuquerque, NM
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Since the stock lift pump is nearly bullet proof,

I rebuilt my lift pump as part of a general strategy to try and find the cause of a slight idle lope. I have noticed a little air in the fuel return line with the original pump as well as the electric pump, but I am beginning to think that a small amount of air is normal.

After replacing and balancing the injector nozzles (Monark), doing the valve lash adjustment, and replacing the rack damper, I am beginning to think that internal wear in the IP is the cause of the idle lope. The engine runs smoothly when off idle or under load.

I am also thinking about building a WVO system for this car, and a powerful electric pump is important for this.
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  #14  
Old 01-17-2013, 02:22 PM
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85 300D 4spd+tow+h4
 
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Quote:
Originally Posted by BitterCreek View Post
No fuel pressure pulses causing idle vibrations? Constant pressure supply at all loads and speeds?
Does the mechanical pump fail to provide enough fuel? Doesnt the over pressure valve regulate vibrations?
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  #15  
Old 01-18-2013, 06:28 AM
winmutt's Avatar
85 300D 4spd+tow+h4
 
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And who's running a modified pump?
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1994 E320 Cabriolet
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