Directly from AirDog....

The blue line that we use is Eaton/Weatherhead. I just went back and talked with our plant manager and this is wat he sent me.

"Our line is the Eaton/Weatherhead H201 “Easy Couple” general purpose hose – contains a nitrile inner compatible for low pressure applications in air, fuel, oil, and water lines. Note that, in this case, “low pressure” means up to a 250 PSI working pressure, and 1000 PSI burst pressure. You know the kind of pressures we’re operating with – not a problem."

 

gauges were the first mod after 4" ex

I actually peg my 30# gauge most times at idle some times it will settle at 21-23.
What does this mean.

Also What is the new recomendation for psi at WOT? I rarely see less than 10

why no anaimation of the avitar my glock is supposed to endlessly shoot !

I must add that the neiborhood diesel vendor may or maynot have switched the unpopular/hard to sell m3s into a m4s box so that maybe why I have slow spool low egs and high FP at WOT. Going to the dyno event at blowing rock, NC to find out

 

Your way to high on the pressure. at no time should the pressure leave the ranges of 7-21psi, never any higher or lower. These psi's may vary a few degree's depending on who you talk to, everybody has their own preference but to be safe it needs to stay between 10-18psi.

You need to separate these two pumps so you can turn them on and off individually. Running dual pumps like this also has some tricks to the trade that you have hopefully accommodated. Do you have a check valve on the outgoing fuel side of both pumps.

 

no bypases or checks.

The pumps are run in a series the stock hard line coming out of tank to a short piece of blue aeroquip hose then the 7# on the rail then blue aero hose all the way to back of stock carter then short sections of blue hose to filter than FP gauge fitting then VP.

My logic was that the stock carter only failed due to the burden of having to draw so far and not push like pumps like to do. And that with the 7 on the rail splitting the burden they should not fail either one.

BUT this leaves no room for error if either one fails the truck would be out of service until the bad pump was changed due to the stopped pump stopping the flow.

So its not perfect but better than stock...

what is so bad about running > than 18psi ?

not to invoke a curse but I have been tapped since like 20K and am on VIRGIN VP now at like 85K

I must have a non brass VP

"Thank GOD for a 56 block and a Good VP"

The high FP is caused I think by the sticking or improper operation of the bypass valve in the VP behind the return banjo- I was fishing for someone to tell me for sure earlier

 

Thats funny. I've seen feet upon feet on this magical blue hose that airdog uses piled up in the corner of Vulcan's shop taken off of trucks because it is not made for the intended purpose that airdog states.

I asked them why they take it off the truck, and looking at it you can clearly see the de-lamination from diesel fuel. Its also probably smart to stamp on the hose "use for on road fuel" which this stuff is clearly not.

I think people mistake the "magical blue hose" for high dollar hose that actually works such as aeroquip products. If it doesnt have an SAE and a number on the hose, it should not be used on the road.

 

Remember, there's many of us running 45 psi at idle and never any less than 37 psi. Still going strong.

Dave

 

Well, not many. matter a fact your the only one I know of actually. I'm basing this off of the Bosch Specs for the pump the designed and built, but to each their own. I know I've done my share of things that were different from the pack also so I'm sure not gonna say your wrong. But I'm also not gonna recommend it for others yet either.

 

I have never seen any specs from Bosch, been looking for years. The numbers you have posted above are what have been posted by guys for years that they "think" are the optimum pressures. And in many cases, electric pumps above 20-22 psi can cause hard starts.

But there's the rub, no one really knows for sure. But high pressures have not killed the VPs in trucks that have run a 12V pump with a cam lobe and no regulator. I have installed many myself, and I know of lots of others. I am not saying I am absolutely right. I am saying there is no real specs to guide us in this.

Dave

 

Can't put my hands on the Specs but they were in a Bosch Guide that a local Bosch Authorized rebuild shop I was workin with a few years ago had on hand. I spent a lot a time hangin around the shop while they were workin with me on diagnosing some fuel issues that Dodge and Cummins had both given up on and just wanted to replace the whole system. The problem turned out to be a series of smaller issues that added up to be one huge pain in the *** but I sure did learn about the entire fuel system through the fight.

 

If you can come up with an actual piece of paper from Bosch that would be great. Honestly, it would be the first of it's kind posted anywhere!!

I have been round and round with Bosch and this issue myself. A Bosch engineer that had direct involvement told me that the pump could handle as much as 65 psi before it started to cause any issues. Again, absolutely nothing to back up my statement. And if he was correct or not, who knows.

My point is, there are some gray areas out there and I stick with low fuel pressure is far more of a concern than high pressure.

Dave