flman

Good One

Yeah, we got a big 2" in upstate NY, I only had to do a real snow clean up, once this entire winter. It has been cold here, but all the snow is staying south. I can bet Obama is rethinking his Global B$ strategy, while the snow piles up in the capital. :banghead: Isn't he the president of Hybrids? Prius "CRASH!"

That sounds logical.

Are you sure you are not pushing air through the lines, as in a leak? I can not hear mine, but I have an axillary electric hydraulic pump running for the brakes and power steering until the engine is started.

Here is a link to the ISB OM. https://quickserve.cummins.com/qs2/portal/manualviewer.html?path=/qs2/pubsys2/xml/en/outlines/3666193.html See: Section F - Familiarization, (53-200-001-tr) Flow Diagram, Fuel System, and you will see at the back of the engine, a fuel return line from the injectors. So yeah it does have a return from the injectors.

I replaced the over flow valve less then a year ago, but that is no guarantee that it is not working properly.

Any one vote in the "copy cat polls" JK, no problem with polls, they give us good info. http://www.cumminsforum.com/forum/98-5-02-powertrain/242949-vp-failier-poll.html

Actually all my Lift pumps were tied up in a plastic bag with fuel residue in them. Here is the part number for the LPs I used to buy Cummins 4943048, I am going to take a good look at one and see if it has a name on it, such as Carter or Bosch.

I was thinking 13 PSI under load, what happens to the return rail under those conditions? But I still dont know why I am getting such a large fuel pressure drop coasting down a hill? Remember I did post that a few days ago.

So, nothing returns from the injectors? When does fuel get returned from the injectors? I may be ignorant, but there is a return line from them right? At least I know there is a Tee in the return line. Refresh my memory please.

My fuel tank is tapped 1/2" NIPT on it, so I am good to go. The original set up was, 1/2" pex to the LP, and 3/8" Pex return. I left the return as is for better VP pressure.

I would think you would be still getting fuel return through the injector return lines at 13 PSI? I would suspect you would still be getting good VP cooling at that pressure?

I know the Repubs are no good either, but Scott Brown did help bring an end to ObamaCare.

Agree with M73M, the line will be too short in length to have any pressure drop only a foot away. I have the OE line going from my OE filter housing, and I am getting 20+ PSI at the VP44 inlet, I am sure it would be a little higher at the filter housing, but at that short of a distance, only a very little bit higher. I might pick up a couple of banjo fittings and put the left over hose to use later?

I imagine Scott Brown and the 2010 house and senate cleaning will slow the socialism down, but it is too late now, and the Dems or Repubs are not gonna save us either way. Maybe we should have all voted for the little "crazy" guy from Texas back in the mid 90s? Too late now I guess

Wild and free, your post is the perfect analogy.

Good choice, on the 1/2" line kit, I changed over to 1/2" and I am getting 20+ psi at idle with winter temps. I used the Fass 95, close enough to the raptor 100. (I have no clue why the Fass kit only came with the 3/8" line as a kit?)

Just wondering, what went bad on the isolator? Diaphragm?

Chip is all business, I don't think he wants to participate in forums, he helps his customers, and potential customers. It would not help his rep if he joined a forum and some one started a pissing contest with him. Some times less is more. Chip has to speak for him self, I am just a customer to him, and I find him to be very helpful and offer great service.

Ok, now lets get back on topic, I ran the 1/2" fuel line today, and I was able to get an all time high in pressures, I filled up after wards, so the fuel in the ground was probably warm, but it was in the mid 30s outdoors. Any ways, my pressure at idle is now 17 1/2 psi and 13 psi WOT. Almost had an FML moment cause the aluminium saddle tank has 1/2" taps. Any ways when I put on the Fass with the 3/8" lines, the flare connector I was going to use, sucked, and it pulled the nut right of the connector. So I rigged up a connection using a 3/8" flare x 3/8" NIPT. I also used a 1/2 x 3/8 bushing, but it had no hex on it, of course the 3/8 fitting came out leaving the bushing behind, with less then 1/4" to grab on to with channel locks, it broke of course, so I was under there with chisel, would not budge, cut it internally with a hacksaw and drove the chisel into the slots and got it out:pray:Ok, now it is back to work, I have a business that needs my attention as well. Talk to you all later.

OK, I found it, it was actually in the Freightliner Drivers manual, under Cummins Engine operation. "Never turn off the ignition switch while going down hill. With the engine still in gear, fuel pressure will build up against the shut down valve and may prevent it from opening when the ignition is turned back on." And that is all they wrote.

By his sig, I would assume the OP is running the stocker pump? Maybe he should get a voltage check at first start with a multi meter at the batteries? I am not sure if the Ram has a decent gauge in dash or not. Mine has an info center, not the greatest but it gives accurate LCD voltage measurements, hours run times, ABS and Engine DTCs.

Actually the OE lift pumps would not allow fuel to free flow past the impeller in the event of failure. The new OEM ones were updated to allow bypass of the lift pump, so the VP to take in fuel on its own, to prevent imminent failure. But yeah, 1 VP failure was enough for me to put in a gauge, and not depend on that feature.

I will have to look at the manual, I thought the VP44 was capable of pulling fuel any ways, mine always did, even with dead lift pumps

You know, I read several years ago in the Cummins engine supplement manual that came with my truck, "do not turn off the key under acceleration or coast, something will break or need resetting in the injection pump" I wonder if that is why the fuel pressure drops at coast, because I the "something" I forgot??