Vegetable Oil SVO WVO waste cooking oil as biofuel

[mike_belben]

a question i received via PM that may not have been clear enough:

The line you cut that goes from the injectors to the banjo bolt on top of the diesel filter, where did you run that to?

it is fuel pumped around the base of the injectors to keep them cool, which normally returns to the fuel filter dirty side. we are teeing it in the with the injection pump return line, then sending the tee'd line to the return valve. injector drain shown in blue, injection pump drain shown in black:

cut injector drain


3/16 hose on the drain line


to a tee down by the tranny



the two lines tee into one, and go into the right hand valve marked "from IP" to send unused fuel back to appropriate tank

hope that clears it up

[mike_belben]

im presently troubleshooting a low pressure condition, and ran a bypass line from Diesel tank feed to strainer input to see what effect my valving had on the situation. fuel pressure at idle was up 7psi.

i am convinced the valves we are using are too small for a truck with larger than stock injectors and/or pump mods. i also deleted the OEM cummins filter housing due to the cost of elements and the horrible location. replaced it with a generic 10 micron spin-on setup located right on the firewall. it is 10x better to work on.

i will report all the details here after i find and repair the issue, and upgrade all the diameters on my system.

[mike_belben]

2 more tips while im on the subject.

first, i suggest all of you run a length of hose in place to do a bypass for roadside repair. plumb it right next to your tank line and right up to your strainer inlet so that you can pull over, loosen some hose clamps and switch the lines in order to get diesel to your fuel pump in a bind. zip tie it all in place, and put bolts with hoseclamps into the hose ends to keep the insides clean. could save you a tow bill some day.

second, for those with hopped up trucks who still want to run a fass or airdog, or for auxilliary/backup fueling, the Bosch Ppump has a feed port on the front that is plugged from the factory, its 18x1.5mm thread and is very easy to connect to with JIC fittings. youd run an electric pump on a switch into a ballvalve or atleast a one-way valve to the front port on the Ppump (so that you arent backflowing in one side and out the other.) when the truck dies or you need more power, flip on the electric pump.

google "P-pump dual feed" for plenty of photos and writeups on the various cummins sites.

[SunWizard]

im presently troubleshooting a low pressure condition, and ran a bypass line from Diesel tank feed to strainer input to see what effect my valving had on the situation. fuel pressure at idle was up 7psi.

The pressure at idle isn't affected by the diameters since the flow is tiny. That sounds more like an air leak issue, which is a very common problem. Have you tried a clear inline filter?

[mike_belben]

i built mine with a bleed port similar to a brake bleeder using an 1/8 needle valve to clear hose into a reservoir for quick filter changes and repair. there is no air whatsoever, all lines are new and double clamped, the heater is deleted.

the idle pressure and loaded pressure are both up 7-10 lbs to around 21-24. i will explain further when i fix the issue and am not putting my foot in my mouth.

[mike_belben]

the first thing i checked was the lift pump, spring was fine, no broken parts, no scores inside.

i exhausted my theories and finally threw a lift pump at it, pressure went up to 32psi immediately and never goes below 30psi even at WOT.

that said, i am getting a bit of a burble at heavy throttle that sounds exactly like running out of fuel, though the pressure is adequate. im making 650ft lbs at the tires, probably losing quite a bit through the stock (slipping) automatic.

feeding the injection pump from the rear OEM banjo fitting delivers fuel to the rack at the #6 plunger. all of the fuel has to travel forward to the #1 cylinder which is prone to starving as the other injector lines drink it up. suspect that might be my burble and think im going to try feeding both ends of the pump for precautionary reasons (they sieze without fuel lubing/cooling)

i notice with the new pump that my purge times are lightning fast. i flip all 3 valves in a row and my fuel temp gauge (at IP) goes from 180 to 150 in about 5 seconds, indicating diesel has washed over the gauge sender. in this weather, even my diesel fuel is at 110 when it hits the IP.

[Clay]

How's the upgrade on line size working out? Any updates?

[mike_belben]

have had our hands full with new baby and second job this year so it hasnt been done. i made the unfortunate discovery that my previous grease process using whole house water filters was actually not flowing much at all until 150*F when the plastic filter element structural tube would deform and fully bypass all filtering. i was loading the motor full of particles and im pretty certain the burble is clogged injector nozzles. i built a pop tester and will hopefully go through the injectors this winter. have since changed to donaldson spin on filters on my processing setup with much success.