It has been a while since I checked out the site. Work, work, work!!! I replaced my 5th lift pump today. I also added an Enterprise pusher kit that I had been wanting to install and had purchased about 1 year ago. Everything went together easily. You could hear both pumps kicking off and I felt that it was going to be truly awesome.
My problem is that I am showing 5 down to 0 psi with the pusher installed. Prior to installing the pusher; I had 12-13 psi. This was with a new lift pump just installed. No kinks and no suction problems (diesel running down my arm at a good rate!). I swapped the pressure reading from the post filter position to pre-filter and could not believe it.
If I let the pump pressure up for a short time; before starting, my pressure shows about 5 psi. If I let her idle for 30 seconds or try and drive, it drops to zero! Has anyone got any ideas? I keep thinking that it may be the filter (pre-pusher). Everything is new from the tank to the inj pump (filters, pumps, etc.) What gives?
I also tried to go back and check up on Enterprise and it's like they are CIA boogeymen! No traces, no links, no webpage and very little threads. Are my pump woes the reason they're gone?

 

Is air getting into the system someplace before the pusher pump? I had that problem when I installed my FASS. The quick-connect they sent did not seal and I had to eliminate it in favor of a clamp.

Chris

 

Pusher pump put in the way that it will be a puller pump ?
I saw problems like this one with almost any kind of pusher- search for air getting into the system, and look at the flow rating of the pusher. If it's to low it will just serve as a restriction for your stock LP.

Just my 2c

AlpineRAM

 

I don't think it has to do with flow cause he WAS reading 12-13 psi. Check for air in the lines and check to see if the pre filter is clogged.

 

I'd say remove the pusher for testing and replace with a piece of pipe. (or whatever fits in) and note the pressures. If a pump has not been used for some time parts can stick and the pump can form a massive restriction even though you hear it "working".

AlpineRAM

 

I checked for air leaks and found none. I tried running the pusher without the pre-filter and gained 1 psi. I then plumbed a bypass in (in case I get the pusher going and it goes out in the future). The stock lift pump then generates 12 psi. The restriction may be the pump. You would think that something marketed as a pusher would be = to or > than the stock lift pump in both flow and pressure.

 

What kind if pump is it? It may just be a defect. If you're fed up and can't get in touch with the supplier to get warranty, you might just have to take it apart and tinker with it. Also, some pumps have an internal regulator, which may be out of adjustment, one of the reasons I ask what kind of pump it is.

Chris

 

You could test the pusher outside the truck. (Like a canister of fuel and some hoses, a battery etc. I think it's just malfunctioning. Either it's gummed up from the long storage and will recover when flushed with diesel (same for the prefilter screen, metal screens tend to have oxyde grow closing the openings where fuel can flow) or it will continue to be of no use. If you can measure the pressure and the flow (Simply by timing the transfer of some gallons from one bucket into another) without restriction and against a restriction of some psi (clamping a rubber line with vise grips comes to my mind) you'll find if the pump in it's present state is fit for your application.
If you can't contact the supplier you'll have to tinker with the pump yourself. If it's a rotary vane pump I had some success by filling those with WD40 and let them sit overnight to break the crud loose.

HTH

AlpineRAM

 

The pump in question is made by Carter. I ordered it from Enterprise Engine as a "pusher pump" kit. The model sticker from the Carter box has been removed; so I cannot ascertain what the flow and psi figures should be. I have contacted the Mitchells and am still hoping for some answers. I ran the pump with diesel in a bucket for approx 5 minutes and it shot a stream of diesel thru 3/8 fuel line about 2.5 feet. A pressure guage attached to the outlet side reads 5.1 psi. I also ran the pump with pre-filters attached and showed the same reading. I would think that the pusher pump would have approximately the same psi and flow characteristics as the stock lift pump. I guess I may have to live with replacing the lift pump on an ongoing basis.

 

Was the 5.1 psi with the stream completely blocked off or was there some flow? A pusher IMHO should be able to flow about 300 gph against a restriction of 5 psi. A high pressure pump won't do any good, as would a pump that will deliver enough fuel until you step on it and then impede the flow.

AlpineRAM

 

Just buy a FASS system and be done with it. Or do the Holley Red as a pusher for the stock lift pump. That setup has been done several times and has proven very succesful and reliable.

 

I'm using a holley blue as the single lift pump. (I mounted it in the frame rail close to the fuel tank)
After some tinkering with the spring of the pressure regulator in the pump I have very consitent fuel pressure of 15psi at wot and 16-17 at idle.

AlpineRAM

 

i put in the FASS and havent had a problem at all. you should just get it and be finished. i dont have a pressure gauge yet, but while installing the FASS i also removed the fitting to attach the gauge! got to get a new one and cut it in.....

 

Sorry to hear about all the problems... but I'm also hoping to gain some knowledge on how to fix this right the first time. My truck had to be towed home last night - lifter pump died (first time). I have some questions for all you gurus:

What is a FASS system?
Is the pump located in the tank?
What are the specs (flow and pressure) of the stock lifter pump?

Thanks in advance for your help!
baldo

1999 RAM 2500, 5-speed, 97,000 miles

 

A FASS pump is a massive electric pump with two RV filters attached to it. As far as electric pumps go, it's the cats meow.

*BUT!

Now that the RASP mechanical lift pump is out, I would go that route and never buy another electric pump again if I still owned a 24v.
I work at a diesel shop, and see dead pumps on a daily basis, as well as having gone through 10 pumps and aftermarket setups when I had a 24v. The RASP is the final word to electric pump haters like me.