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Topic: Atlas Radiator > Fuel Coolers > Lift Pump Discussion (Read 1538 times) previous topic - next topic

Re: Atlas Radiator

Reply #20 –
I removed this assembly from mine when I put in a new Mishimoto fuel cooler, full time HD FASS UP95 lift pump, and re-plumbed the fuel cooler loop. I took it apart and the only component that isn't a fitting is a check valve of sorts. The rube goldberg assembly adds no less than five 90ยบ elbows and all the check valve could do as far as I could tell is allow some fuel to bypass the cooler if the fuel cooler was somehow clogged. John Haygarth's 2000 ISC does not have it and other 2000 and later coaches that I have looked at do not have it either. I made a function diagram of it while figuring out how to plumb the loop without this assembly. The I/O of the Mishimoto cooler is on one end and I had to fabricate mounts. The original cooler was held on by a couple of of cable clamps. The new one has threaded bosses welded on for mounting and AN fittings for the plumbing.
Don
Quote from: bbeane –
Mines is mounted different but the same cooler. The plumbing for it is some what of a mystery. Out of the transfer pump body to the mystery mess to the cooler out of the cooler to the mystery block then out to the tank. Only thing I can think of is it's a thermostat of sorts, or just a bunch of fittings

Re: Atlas Radiator

Reply #21 –
Thanks Don, I started to install that piece in the unnecessary parts bin

Re: Atlas Radiator

Reply #22 –
Don,

Thanks for the post.  I will have to check my coach out to see if Rube Goldgerg worked on mine. 

Richard

Re: Atlas Radiator

Reply #23 –
It will be interesting to see if they used this assy. for the 99' ISM equipped coaches. I bet the ISM's don't have a lift pump that only runs to prime the injection pump and then becomes a passive pass through manifold along for the ride...
Don
Quote from: Jan & Richard –
Don,

Thanks for the post.  I will have to check my coach out to see if Rube Goldgerg worked on mine. 

Richard

Re: Atlas Radiator

Reply #24 –
Quote from: Don & Tys –
It will be interesting to see if they used this assy. for the 99' ISM equipped coaches. I bet the ISM's don't have a lift pump that only runs to prime the injection pump and then becomes a passive pass through manifold along for the ride...
Don
No lift pump for my '99 ISM or M-11 which ever it is.

Re: Atlas Radiator

Reply #25 –
Chuck,
Are you saying that the ISM fuel injection pump has no low pressure fuel transfer pump and relies entirely on suction of the gear pump component of the injection pump to bring fuel all the way through 25' or 30' of fuel line? I find that surprising after my experience trying to address my fuel starvation issue. It seems to me that such a design would be very prone to even the most minuscule air leak on the suction side of the fuel supply.
Don.
Quote from: craneman –
No lift pump for my '99 ISM or M-11 which ever it is.

Re: Atlas Radiator

Reply #27 –
More research is needed as I don't see the priming pump on pictures of M11's fuel system which can't be copied and pasted.

Re: Atlas Radiator

Reply #28 –
I think the prime pump is integral with the fuel filter

Re: Atlas Radiator

Reply #29 –
My priming pump is part of the primary fuel filter.

Re: Atlas Radiator

Reply #30 –
I guess my question would be whether or not the priming pump you are referring to is running when the coach is going down the road or whether the injection pump has help once the engine is running. In other words, if you were to put a fuel pressure gauge just before the injection pump while the engine is running, is there a vacuum or is there a positive pressure ahead of the injection pump. Before I did the HD lift pump mod on our coach, such a gauge would have registered between 5 and 15 psi when you turn the key on (which primes the injection pump) and a vacuum 30~45 seconds after the key on event. Now, there is a constant low pressure high volume feed (12.5 psi to 17.5 psi) while going down the road.
Don
Quote from: craneman –
I guess you could call my priming pump a lift pump. I always referred to it as the primary pump on diesel engines. The ISX is the only schematic I could find. I believe that they would be the same.
Fuel System Cummins ISX15 CM2350 - Electronic Engine - Blog.Teknisi

Re: Atlas Radiator

Reply #31 –
Don I don't think there is any 12 volt pump that comes on with ignition. Our priming pump is only used for filter changes. Tomorrow I will visually look at the fuel lines on the coach, but my memory says when I did my fuel lines the line from the tank went to the primary filter to the fuel pump inlet then to the secondary filter then to the ecm cooler.

Re: Atlas Radiator

Reply #32 –
Need to change this from radiator to lift pump choices.

Re: Atlas Radiator

Reply #33 –
It's good to know my radiator would support a M11 engine. 

Re: Atlas Radiator > Fuel Coolers > Lift Pump Discussion

Reply #34 –
Quote from: John Haygarth –
Here is the cooler on our 295
Johnh

Interesting thread. Had read about the desirability of the fuel cooler but never took the time to look.  Looks like our 2000 ISC has the same one...either factory or previous owner. 

Re: Atlas Radiator > Fuel Coolers > Lift Pump Discussion

Reply #35 –
Quote from: Don & Tys –
I guess my question would be whether or not the priming pump you are referring to is running when the coach is going down the road or whether the injection pump has help once the engine is running. In other words, if you were to put a fuel pressure gauge just before the injection pump while the engine is running, is there a vacuum or is there a positive pressure ahead of the injection pump. Before I did the HD lift pump mod on our coach, such a gauge would have registered between 5 and 15 psi when you turn the key on (which primes the injection pump) and a vacuum 30~45 seconds after the key on event. Now, there is a constant low pressure high volume feed (12.5 psi to 17.5 psi) while going down the road.
Don
Don the prime pump only runs when requested by operator. There is a control box back in the engine compartment at top. Press the push button and it runs for like 30 seconds. I installed a filter minder on the fuel vent valve to show filter condition. Past screen and first fuel filter. Shows half scale with new filter and old lines. Haven't drove since fuel lines were changed, but hope to take it out this weekend. I'm curious about your fuel cooler. I have the same Aftermarket  brand cooler on my on my Dodge 3500 truck transmission. Very robust cooler
Did your cooler come with the thermostat like mine or without.
Scott