lil'dog, how about a bentley nevada or equivalent vibration pickup,say the acclerometer type? You could firmly attach it to the line. You would have to isolate the line fairly well from the engine though or youd get lots of action from that. Perhaps a rubber line would do the trick for isolating most of the engine vibes and you you perhaps pick up the frequency and spectrum of the wall of the line. And in your industry, you could just borrow one and try it as an experiment. Plus, its non-intrusive... you dont even need to get diesel on yur hands... l0ol




Kevin

 

I've always thought the lp problems come from VP pulsations.
One of these $47 gizmos might be the ticket http://www.matronics.com/fuelchec/dampener.html

 

My revised Smart Flow kit is all rubber lines with push locks.

I still offer the braided but its not nearly as popular.

The Aeroquip hose I use is the best push lock hose made.

 

Infidel, this is precisely what you need. However, to do it even better, try to find one with a bladder inside of it. The air or nitrogen is charged into the top above the diaphram with a schraeder valve (tire valve) and the fuel is below the diaphram. By varying the pressure charged on top of the diaphram you can vary the amount of dampening. This is excatly what is done on hydraulic system accumluators and home water well systems, although plenty of wells have a bladderless style too.



Kevin

 

Moving the stock LP to the frame, back by the tank, and upgraging the banjos is the cheapest way to fix the LP problem.

 

Yes you could do that too. My analyser also has an accelerometer that could be used, but the size of the accelerometer would add mass to the system. From the vibration spectra, you could detect some of the resonant frequencies. I still think the direct pressure measurement would be the best route. That would give a more definitive answer.

Just FYI my analyser is the Windrock 6310PA... Windrock website

This is interesting R&D.. Now all I need is the shop, some equipment and a doner truck...

 

Like one of these. Not sure if it's compatable with diesel but it wouldn't be too hard to find out, only $18
http://www.grainger.com/Grainger/pro...mId=1611591756

 

Thaatzzzzz it. Thats whats on mine. Not sure if its compatible with #2 oil either, but its been on mine for a few years now!!!


Kevin

 

Yes an accumulator may work, however it is cumbersome under the hood. If you could do the damping required with just tubing and increaseing length a bit, it may be easier to sell as well as look at.

 

Kevin--

I should have spoken more carefully, as I agree with everything you wrote. In context I ASSumed that "change in pressure" meant "decrease.

Also, when I said "directly proportional" I meant that there is a direct relationship, not necessarily proportional, linear, exponential, what have you. I again misspoke.

Thanks for contributing so much to the quality of this thread, and I'll try to be more careful with my verbiage

Justin

 

Dampening pulsations to the lift pump, wouldn't it already have some kind of dampening from the fuel filter. Just questioning.

 

Good point.. How much would it provide and is it enough?

Very good question actually.

The main point I was after was saving the VP44, not the LP so much. And answering the question of the required fuel pressure sparked all of this.

 

Kevin,

Could you please post a picture in your gallery. I would like to see what it looks like installed.

Thanks.

 

It wouldn't dampen because it's entirely full of fuel and the housing is for the most part inflexible. Real dampeners either have a rubber blatter with air on one side or are a sphere partially filled with air.

 

I guess I was thinking more of the fuel filter and volume of fuel. I know it probably wouldn't be much but I thought I would throw it out there just to get some opinions.

I can see guys running out to their trucks with tubing cutter in hand and cutting sections of steel tubing out and replacing with rubber hose , who knows maybe it might help.