2nd Gen Non-Engine/Transmission New fuel delivery idea for vp44. Would it work?

[firefighter_2000]

Had a new idea for supplying fuel to the system. Completely close the fuel system. . Air tight. Use a good quality air pump, pressurize the air space above the level of the fuel. Use air pressure to force fuel through the line to the vp44. You're only limited by the quality of the air compressor. And the Would have to experiment with how much air pressure it would require to maintain the constant that you needed. Think it might work??



Think of it like this. When you had a juice box as a kid, like hi-c or something, and you blew into the straw, and blew the box up like a baloon. What happened when you took your mouth off the straw? You made a mess and got a face full of juice. Happened to me last week!!



Craig

 

[Coalsmoke]

Craig, I'm confused why someone would want to go through such a complex approach. You would need at least two tanks with a transfer pump for your fuel return loop to work.

 

[firefighter_2000]

Classic Case

Classic case of posting before I thought it through. Never even thought about the return. Sounded good tho...

There just has to be a better... failsafe system that will solve the transfer pump problem permanently.

Craig

 

[kenny61]

There just has to be a better... failsafe system that will solve the transfer pump problem permanently.

Craig

There is... . it's called the 12 valve :-laf

 

[firefighter_2000]

I wish

If only I could find an 98 QUAD cab with the 12 valve. I'd LOVE to have that. I love my quad cab too tho. I just couldnt turn loose of enough money at once to do the vp44 to p-pump conversion.

Craig

 

[Coalsmoke]

I almost bought a 98 12v quad cab last year, bought my 01. 5 instead. Yes the P7100 would be nice, but I am hoping the VP44 will behave itself. I figure if I get in the ballpark of 7 years to an injection pump it will be acceptable, mind you I do my own work so there aren't any labor costs for me. As for lift pumps, hasn't FASS fixed that issue with their replacement pumps? I sure like having the 6 gears, rear discs, etc. that are on the 01. 5 but those were my chips I was willing to trade the 12 valve for.

 

[BarryG]

As mentioned previously there are several pumps out there that are pretty good. Fass, Airdog, Glacier Fuel Boss and Mitusa among others that I have surely forgotten. As well as what I did which was put in a cam and then converted to a 12 valve mechanical lift pump.

 

[icman95]

I put in a FASS pump and that seems to have solved the problem. A fuel pressure gauge ensures that I will always have the proper info regarding the pumps. If the gauge tells me bad things, I know it's time to fix stuff-before the vp44 goes bad.

 

[WestTN]

A pressurized fuel tank is against the law.

It would be a major fire threat.

To make this particular application worse, these trucks hav a plastic tank.

Fueling the truck would become a compliated process.

 

[firefighter_2000]

Explain?

Pressurized is illegal? How do the propane powered vehicles get away with it? Those are pressurized right?



The idea was an outside pump would keep the tank pressurized. If you took the cap off, the pump obviously wouldn't be able to keep up and would simply de-pressurize and not be a problem during fill ups.



Also... . As stated. I posted before I considered a lot of those items. Not really a good idea.

 

[SRath]

I had an International semi tractor with a little M11 cummins that one day decided to start running very badly going down the road. my fuel gauge was dropping like a rock, too. every now and then someone would honk and act po'ed when they passed me as I tried to limp it in.

I made it to the Cummins dealership, and when the guy unscrewed the big 4 inch fuel cap on the passenger side, pressurized diesel shot a couple feet up into the air! That takes a LOT of pressure!!

It was a company truck and I left with a loaner and never got the full story, but it had to do with a couple injectors going bad and the fuel comes out of the driver side tank and gets returned to the passenger tank and since it was all getting returned, it pressurized the tank somehow. What I never understood was how the crossover hose between the tanks didn't keep things equalized?

I don't think I would want a pressurized fuel system again! But hey, you were thinking outside the box at least!

 

[rweis]

I run a mechanical pump from DTT.



I did some research into other mechanical pumps and found some just like the DTT pump. The problem is driving the pump with what and where. The electrics will eventually all have an electrical issue. I think it has to be driven off the serpinetine belt. You have to have the serpinetine belt for anything to work.



I also think that the pump has to be a commercial industrial current production mechanical pump that has at least 10 years of proof testing and not modified from anything (which there are several that fit the bill).



Question is how to drive it off something mechanical and substancial.



I know that if we really got our heads together we could come up with something. I no longer run the "traditional" APPS, mine is a microswitch good for 1,000,000 cycles.



I have several industrial pumps just like the DTT one in the research folder, just need a way to drive / mount them.



Bob Weis

 

[Gary - K7GLD]

SHUCKS - I thought the WIDE variety of aftermarket pusher pumps, as well as the toughness of the later upgraded VP-44's had pretty much put IP issues on the back burner! :-laf



I like my Walbro just fine - but the relocated OEM Carter and series-ed lower PSI helper were still running perfectly when I switched to the Walbro purely out of curiosity...



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The OEM Carter is still in the line, seen further forward - but is disconnected, and only there for emergency backup.



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