[MR. MUD]

For a while I have been suffering from fuel delivery problems as a lot of you have also. I have changed everything and traced everything that has been suggested in various threads and sometimes still have had problems. My issue seems to arise most times when the fuel tank is getting empty, and yes I checked the drop tube in the tank. It seems that the pump just doesn't have the nuts unless the tank is fuller and I have not pulled it to see whats up inside it. I was speaking to a friend and he suggested a low (9 psi) electric fuel pump. Has anyone tried this? The ones on the older John deere combines are very compact and only about $28.00. Any thoughts please chime in. MUD

 

[Mogasaurus]

Mud, have you looked into just rebuilding the engine mounted pump ? That couldn't cost all that much...

 

[coachgeo]

have used small Faucet Purlator cheapo pumps to diagnose problems. For example add one back by your tank and let it help push fuel to the OEM pump might help. If fuel leaks anywhere along the way.. then you had air coming in at that same spot previously. orrrr if nothing leaks it mightttt be fuel pump like you suspect.

I say "might" cause an air leak does not alllways leak fuel in this situation. Low tank if I got this right means increased vacuume to pull fuel. so maybe you have an air leak that only manifest it self under high vacuume. Above test of added fuel pump may not leak fuel out of an air leak area that only leaks under high vacuume.

 

[MR. MUD]

Mud, have you looked into just rebuilding the engine mounted pump ? That couldn't cost all that much...

I have considered this but I have reached the ultimate in frustration level and it looked so easy(hence my apprehension) to just install an electric pump right on the side of the tank where the inline bulb strainer is now and see if that solved the problem. It looks as if this would take only a few minutes and then I might not have to deal with the existing pump. This is just a thought as I am not sure about the pressure that the current system requires or if I would need to also include a regulator system. Current setup looks as if it has a return line for unneeded fuel but again I am no motor mechanic, just a fabrication man and operator. MUD

 

[Mogasaurus]

Yes, the current system has a return line (like most injection systems). Note that there is also another 'return' from the cylinder head that takes care of the leakage and bypass from the injectors - don't forget to plumb that into whatever you end up running.

I don't know what the output pressure and volume of the engine driven pump is. Oddly, my databook has no information on it.

 

[hammogger]

I have a 406 with such an electric pump located back near the tanks. A previous owner installed it. The truck runs fine without it so I have only used it for priming the system after a filter change. It does work as you intended.

One thing about an electric pump is that if you have an air ingress problem past the pump toward the engine, the e-pump will charge the system and you might find the leak, or maybe not.

In the case of a long term fuel starvation problem, I'd sure try that e-pump.

If you get an e-pump that lets fuel flow through it when not powered up, you won't have to use it unless needed. Personally, I'd prefer to keep the system stock and simple.

Bob

For a while I have been suffering from fuel delivery problems as a lot of you have also. ..chop....Any thoughts please chime in. MUD

 

[MR. MUD]

Mogasaurus: I think you confused me. My intent is to leave everything stock from the old strainer forward so are you suggesting that I would have to replumb some of the return lines off the injector pump?

Hammogger: Hopefully you are still staying on this thread. Are any of your other return lines altered? Do you know what pressure that pump runs at? As for an air ingress problem, I am 100% positive now that is not the case as I have tested every single spot now with the suggestions made from other forum members. I did remedy some problems, both from my inexperiance and from old age of my mog.

I believe I will give it a go as I am only out a short amount of time and for once not much money. I realize that these engines are designed differently than what I am modeling this from, but my friendly John Deere mechanic has shown me the application from an older combine and it seems to have the return lines run similarly. I probably need another "life experiance" any way. MUD

 

[hammogger]

Hi Mud,

That old pump was undoubtedly a low pressure pump, maybe 6 or 8 psi, certainly no more. Most any pump you buy today will put out that much pressure or more, and higher pressure won't hurt anything. Even one of the modern in-tank pumps that puts out 50-60 psi could be used. Hmmm, really had never considered that but there could be some advantages, like keeping the pump out of harms way. Probably much more expensive though, and more trouble to install.

My return lines are not altered. Only the fuel supply line was cut and the pump installed.

BTW, don't read me wrong, I'm always for doing whatever renders the truck more usable and reliable, and in your case getting fuel to the engine is rather important!

Bob

Hammogger: Hopefully you are still staying on this thread. Are any of your other return lines altered? Do you know what pressure that pump runs at? ...chop...MUD

 

[MR. MUD]

Failed miserably. Hooked up in feed line, turned it on and got fuel circulating, bleed filters, fuel circulating back to the tank but wont start. Did not bleed injector pump as was running out of daylight and mog is a ways from the shop. Back at it tonight weather permitting. Maybe as Hammogger said I need more pressure than 4-7 psi that this pump is putting out.?????????????????????????

 

[Mogasaurus]

Mogasaurus: I think you confused me. My intent is to leave everything stock from the old strainer forward so are you suggesting that I would have to replumb some of the return lines off the injector pump?

No. I thought you were going to completely bypass the engine driven pump and go electric only.

I don't think you need much pressure - just sufficient volume to keep the IP fed.

 

[hammogger]

Nope, didn't say that. I agree with Mogasauras that low pressure should work fine, and that's especially true if the original pump is left in place (best plan, IMHO).

Bob

..chop....Maybe as Hammogger said I need more pressure than 4-7 psi that this pump is putting out.?????????????????????????

 

[Mogasaurus]

(best plan, IMHO).

Actually, I think the BEST plan is to simply rebuild the OEM mechanical pump (or correct whatever thing is making that pump ineffective). But, that's easy for me to say, sitting here in my comfy chair

 

[MR. MUD]

Got the beast cranked up last night, new plan developed after getting it started and finding a new issue. Started off from square 1 changed fuel filters, reprimed and popped the power to the the electric pump and wahoo!!!!!!!!!! I'll try it again tonight to make sure it wasn't a fluke before I install anything permanant. MUD