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| Re: [GMCnet] Fuel filters [message #328174 is a reply to message #328163] |
Fri, 12 January 2018 14:25   |
powwerjon
Messages: 849
Registered: March 2013
Karma:
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Senior Member |
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There no such as a clean fuel tank as the fuel being loaded into your tank can have contaminates at any time, including the stuff that get loaded when the gas station storage tanks are low and haven’t been cleaned lately and that happens not as often as you think and the possible contaminated fuel right out other delivery tanker.
In the first coach which was a 77 Eleganza II with a 403 and Paterson Carb and all electric fuel system with mechanic pump removed I ran 2 fuel filters. One before the pump in the back and one before the carb in the front. I also which was my choice to remove the internal fuel filter in the carb. I change the filters in the spring and in the fall. The front filter was moved to the back and the back and a new filter was installed in the front. Twice a year for us because the coach was used year round with trips to Florida or Arizona in the winter. Those of you that store your GMC would only need to replace the filters in the spring.
http://www.gmcmhphotos.com/photos/electric-fuel-pump-26amp-3b-filter/p9898.htmloperating
Our currant GMC is a Buskirk Stretch actual length 29.5 foot long. It has an MPFI with a low pressure and High pressure pumps located back near the fuel selector valves, which were changed recently. The first is a large preflight that also is a coalescing filter to remove any water that may get loaded from the stations tanks. It then is pumped by the Low Pressure Pump (carter P4070) and then to the High Pressure which is our case is a pump used by Mercedes 450SEL then the final filter to the fuel rail and returned to the tank that in comes out of.
J.R. Wright
GMC GreatLakerTech Editor
78 Buskirk 30' Stretch
75 Avion Under Reconstruction
Michigan
> On Jan 12, 2018, at 8:38 AM, James Hupy wrote:
> Fuel filters do serve a real purpose. Fuel is not always clean when it is
> delivered to stations, nor are station storage tanks necessarily debris
> free. Most pumps do not filter fuel either. So, if you rely upon the carb
> inlet filter exclusively to deliver clean fuel, expect it to require
> service. Carry spares. If you use an electric auxiliary fuel pump, most of
> them require a pre filter as well.
> I guess that it comes back to periodic maintenance. Air filters, fuel
> filters, lug nuts, tire pressures, lubrication, oil changes, walk around to
> check lighting, etc. Pretty necessary on 40 year old vehicles.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
>
> On Jan 12, 2018 7:07 AM, "John R. Lebetski" wrote:
>
> Seems tanks are either operating room clean or nasty. If clean, you don't
> need add-on filters (added fail or fire risk) and if the tanks are nasty
> due to dirt in filter evidence, they need to be dropped and corrected.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
>
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