I have a similar setup and mine doesn't change pressure at my hp levels... so how could he have a volume problem?

 

I wonder if the bypass could some how be the problem???

 

You could be 100% correct, but given what he has shared so far, it seems like a volume issue. Could be that the way he has it plumbed is somehow restricting volume. Seems unnecessary to me to run such a high pressure. What gph are you running?

 

IIRC, the Walbro is rated at 62GPH ? Sounds pretty close to spec. It could be a volume issue simply because of line size. Madhat......where did you measure your volume at? Pump or cp3?

 

I run the Walbro at 20psi which gives 90 gallons per hour.
10psi would give about 92gph
30psi = 85gph

At 90psi the little pump still gives 60gph and I don't know why anyone would use that kind of pressure... even a gasser...

I don't know where the 60gph max number came from but it's wrong.

 

I dont know that the 60gph was a "max#" but it was approximately what the original poster had indicated he was seeing when he tested the flow.

 

I understand... and I think he has some type of restriction OR he's getting air into his system somehow...

 

Air is interesting, but I would think that would make for pressure fluctuations all the time

 

Trik..... I don't know where you got your numbers, but here's what I have found at numerous sites. The Walbro 392 fuel pump is rated at 255LPH @ 0 psi. That equals 67.3638734 US gallons. Increase restriction ( i.e. pressure ) and you will decrease volume.

 

some of you obviously missed this spec sheet for a 392...

It depends on the voltage sent the pump as to how much flow you get...

as you can see, you get a little over 45 GPH @ 75psi with 12V- at 13.5V you get 52 GPH @ 85psi Obviously a restriction would cause less psi and flow.

 

I have the same fuel system as you and it supports 700hp. madhat you make just take a look at your canister lid and see if its cracked maybe. they say if you go above 20 or 30 psi that stock plastic lid can crack. I bought one from genos but never installed it. it was very well made, im not trying to sell anyones products either. I run mine the way it came out of the box. I do have the big line kit, but still running the stock canister. I plan to do away with the stock canister and run a bigger fuel system with filters soon

 

I got it from the same place Tritont did except the grid I have shows a 14volt pattern also which is where I used my numbers...
It's also on Glacier Diesels site.

powerful little pumps... ain't they...

 

hey buddy, Im having the same problem and have been having this problem since the beginning. Im going to get to the bottom of it some day

 

Ok... here's more...

Today, when I jump in my truck, I only get 20 psi when I turn the key on... Weird, I think, usually I bend the needle on 30 with in 1/2 a second of hitting the key.... grid heater kicks off, I see a 2 psi raise... fire her up, 21-22 psi. Truck is pulling pressure down from a light acceleration... all the way to 10-15 PSI... so I think, hey, my filter is clogged... by the time I get to work, it's almost normal at idle...


When I get home today, I changed both filters, made sure that I did not have any leaks. Fired her back up... pressure rises slow, I cycle the key again to make sure that the new filter is full and the pressure is built up... still slow. Fires up fine, but same problem going down the road.

BTW, I have just shy 14v across the two posts.

I'm about to get an air dog or something.


I have a billet FF lid.

I have checked for leaks I don't think that I'm blowing fuel anywhere...

I'm gonna turn it down tomorrow, but I don't think that's it.

When I am near the pump, it sounds like it's pulling air... sounds like a small vaccume...

It's always something...

 

Hey, chet, if I figure it out, I'll tell ya. Might have to get another pump.

BTW... this is the disclamer... This is NOT a GDP Pump. I got scammed by someone that I thought was GDP... they even sent his instructions with the pump... I have dealt with Richard a few times since I figured that it was not his pump... he has always given me jam up service. I'm sure that if this was one of his pumps, he'd have another one in the mail to me already.

HECK of a jam up guy...

What do ya'll think of this?

http://www.glacierdieselpower.com/pr...pf_id=FB-03045