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Old 10-17-2019, 11:30 AM   #43
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Hello I installed a Fass fuel pump in my Winnebago Ultimate Freedom 83 Cummins 350 horse as shown in first diagram on this post. Fuel from tank goes to Fass pump which is where my primary filter was. From there fuel goes thru stock lift pump to secondary filter with water sensor in it and from there to caps pump...is this acctable?


http://www.irv2.com/forums/attachmen...5&d=1563763717
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Old 10-17-2019, 10:36 PM   #44
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Quote:
Originally Posted by Accurite View Post
Hello I installed a Fass fuel pump in my Winnebago Ultimate Freedom 83 Cummins 350 horse as shown in first diagram on this post. Fuel from tank goes to Fass pump which is where my primary filter was. From there fuel goes thru stock lift pump to secondary filter with water sensor in it and from there to caps pump...is this acctable?


http://www.irv2.com/forums/attachmen...5&d=1563763717
Personally, I think people do it this way because itís easier. I donít think running the fuel through the lift pump is the way to go. Just bypass it, less chance of a fuel leak and less restrictions.

Bill
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Old 10-17-2019, 11:13 PM   #45
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Personally, I think people do it this way because itís easier. I donít think running the fuel through the lift pump is the way to go. Just bypass it, less chance of a fuel leak and less restrictions.

Bill
My OEM lift pump developed a leak. This is partly or entirely what lead to the demise of my vp44. Getting rid of the original lift pump is the main reason I put on the fass pump.
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Old 10-18-2019, 10:37 PM   #46
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Went to the local Cummins dealer. Checked out my type of lift pump, there is a diaphragm/check valve that allows fuel to bypass when the lift pump shuts down so the caps pump can draw the fuel through it from the tank. I talked to Fass they said it was acceptable to push through this type of pump as the caps pump has to pull through it. I wouldíve had to do a lot more work to bypass it also if I need to use the old lift pump I switch two lines and two wires and Iím back to stock. I also installed my fuel pressure gauge in the filter which has the water sensor, this is the filter after the lift pump just before the caps pump. Seems to be working fine, reading 16 pounds of pressure, drops to 15 when I put my foot into it. Lots of battle scars during this project my skin isnít what it used to be! Thanks for all the info everyone posted this is a great forum!

2000 Winnebago ultimate freedom Spartan chassis 350 hp Cummins 98,000 miles and still going
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Old 10-18-2019, 10:41 PM   #47
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I replaced my lift pump a year ago I will keep my eye on it for leaks thanks for the heads up
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Old 10-21-2019, 10:00 PM   #48
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Made my test run up to the local mountains, fuel pressure was holding at 15 to 16 PSI. Thought I was doing good till I looked down and saw a check engine light, pulled over looked in Silverleaf diagnostics and saw multiple fuel injection codes. Switched hoses back to stock finished my trip pulling some steep grades and the engine ran fine so I guess itís not wounded. I may or may not continue this project bypassing lift pump at a later date. At least now I have a fuel pressure gauge showing 15 psi when the lift pump is running
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Old 10-21-2019, 10:03 PM   #49
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Made my test run up to the local mountains, fuel pressure was holding at 15 to 16 PSI. Thought I was doing good till I looked down and saw a check engine light, pulled over looked in Silverleaf diagnostics and saw multiple fuel injection codes. Switched hoses back to stock finished my trip pulling some steep grades and the engine ran fine so I guess itís not wounded. I may or may not continue this project bypassing lift pump at a later date. At least now I have a fuel pressure gauge showing 15 psi when the lift pump is running
Which FASS pump do you own?
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Old 10-22-2019, 10:30 AM   #50
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Made my test run up to the local mountains, fuel pressure was holding at 15 to 16 PSI. Thought I was doing good till I looked down and saw a check engine light, pulled over looked in Silverleaf diagnostics and saw multiple fuel injection codes. Switched hoses back to stock finished my trip pulling some steep grades and the engine ran fine so I guess itís not wounded. I may or may not continue this project bypassing lift pump at a later date. At least now I have a fuel pressure gauge showing 15 psi when the lift pump is running
So your back to the stock configuration? What codes were thrown? Did you disconnect the power to the lift pump when you did the Fass conversion?

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Old 10-23-2019, 09:57 PM   #51
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Yes Iím back to stock going to stay that way take my chances with the old system and yes bypass the lift pump with a relay. The pump was a titanium series 95 gallons an hour 17 psi. Codes injector cylinder number 19 frequency error, injector cylinder number 18 high reading, injector cylinder number 18 low reading, and a few other codes with injection system.
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Old 10-28-2019, 01:39 AM   #52
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Accurite: You went to a lot of trouble to install a FASS Titanium Series pump with 2 additional filters.

* Can you elaborate on your those error codes a bit more? What were they again, and are you saying those codes went away after you returned your fuel lines to a stock fuel delivery configuration?

* What year is your coach? Model? Engine type? Chassis type?

* When did you add the Silverleaf System?

* Are those error codes from a scan tool?

* Did your engine experience an engine "de-rate" when these codes triggered your check-engine light? Any loss of power?

* Did the check-engine light go away at any point while the FASS pump was installed?

* Can you provide us with pictures on how your mounted the FASS TS pump in your engine bay?

* Did you have any trouble installing the "Y" yoke-adapter in your fuel filler neck? And was your slide out a concern? Mine was very tight. Can you include pictures of this area? It might be helpful to the rest of us!

It sounds like your code descriptions were due to too much pressure. Is that right?

I would have called FASS to ask them about how to adjust he spring in the fuel out-port, because that is what is used to set the FASS "TS" pump pressure. ... Let us know what you do. Thanks!

My TS pump always reads 15-16 PSI. I have never seen 18 PSI, and I have a remote gauge in my cockpit. (Your oil filled gauge on top of your filter is probably more accurate.) However, I do see my fuel pressure occassionaly hit 17 PSI and under load I see 14-15 PSI now that I have over 8,000 miles on my filters. This may or may not be relevant. I only mention it, because I'm still trying to decide if fuel pressure from the FASS TS port can indicate when the filters need changing? But I am told by FASS you cannot assume a drop in PSI is indicative of a restriction in the filter. However, I think it's possible that under acceleration you will see more of a PSI drop as your fuel filter go from new to 30% to 50% restricted; and by then your filters will be 2 years old that's about the time I will change them. TBD

Please refer to the diagram below for how I installed my FASS TS Pump in my Winnebago Itasca - Freightliner Chassis; which was based on a 2-filter set-up before I installed the FASS "TS" Pump. (See .pdf for installation instructions attached.)

In this case I just removed the primary filter and mount (on the left side of my engine bay) and installed the FASS TS Lift pump in it's place. And then I had Freighter install a relay (using the right wire harness) to trick the ECM into thinking there is a "load" on the other end.

How did you connect your 2 ECM wires to the relay? Cut and soldier or did you get a compatible wire harness so you know you have good connections?

FASS TS LIFT PUMP NSTALLATION OPTIONS


*Most RV owners with an Independent Front Suspention (IFS) up front do not have room to install the FASS TS Lift Pump by the tank; and even if they did... you cannot access the top of the tank in a Freightliner Chassis.

* Monaco owners with a Spartan Chassis should have access to the top of the fuel tank and can more easily bypass the Cummins Lift Pump in the engine bay. In these installations you should follow the "pink highlighter" in the drawing.

I frankly have nothing but good things to say about my FASS TS Pump installation. And after 8,000 miles I have never once had an engine check-light problem. I also carry a portable scan tool and have checked my ECM for soft error codes and there are none.

My feedback is all positive. I even think the FASS TS "fuel polishing/re-circulation benefits" mean I no longer have any algae concerns in my tank!

The first diagram is for a Winnebago Itasca - Freightliner Chassis (with IFS).

The second diagram I think was provided to me by TR4, where he shows how he would run the fuel deliver lines and bypass the lift pump all together. Monaco's with a Spartan Chassis will have an easier installation if they can mount the FASS TS Pump near their fuel tank... and can access the top of their fuel tank where they can insert a "T-Fitting" to handle the FASS fuel return line. Then you can disconnect the old fuel out line from the tank to the the lift pump manifold (and just plug it). Then you can run a 38' fuel line from the FASS TS out fuel port DIRECT to the injection pump... and bypass the lift pump completely.

Accurite: Do you have 2 or 3 fuel filters in your setup?
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File Type: pdf Mark's FASS Lift Pump Installation Guide, (IRV2) 8-1-19 (PDF).pdf (2.76 MB, 2 views)
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Old 10-28-2019, 02:40 AM   #53
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Here is the link to the thread I started on how I installed my FASS TS Lift Pump in my 2004 Itasca "Horizon" 40AD (Freightliner Chassis).

Cummins ISC - Engine Starts But Then Quits & Why We Upgraded To FASS TS Pump!!!!
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