| Re: [GMCnet] fuel pump discharge [message #281078 is a reply to message #281049] |
Tue, 30 June 2015 12:17  |
powerjon
Messages: 2446
Registered: January 2004
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Also remember that the carb filter can be installed backwards and will cause similar symptoms. We were traveling with 3 other coaches going to AZ several years age. Stopped in Carlsbad NM for a few day to explore the area. One of our group change his fuel filter the next night and didn’t tell anybody. Going north to Artesia his coach would for 10 to 12 miles and then run out of gas. Seeing he had just changed the filter he thought the pump was bad and we change out his spare pump. Ran for a little bit and then died again. We sat and brainstormed what had change the last few days and he said that he had changed out the carb fuel filter. First question was is it in correctly? Took it out and turned it around and ran well with issues. Sometimes it can be the simplest things that can drive you nuts. I know that you have had a lot of suggestion, but if you have been changing the filter and still having the same issues you probably installing it the way you just took it out and and it is installed wrong. Spring and flat metal end goes towards the carb and the end with the hope goes towards the fuel inlet. The gasket the should be about half way down the inside of the filter housing on the carb.
Go to MM X7525A, Sec 6M, P2, Fig. 2 & Sec 6M, P18, Fig. 22
http://www.gmcmhphotos.com/photos/general-pictures/p58268-q-jet-fuel-filter.html
It is so easy to put that sucker in backwards if you’re not sure and guess. On the inlet end you have the rubber gasket and when you look inside the filter has a check valve that prevents back flow.
http://www.gmcmhphotos.com/photos/general-pictures/p58270-img-07751.html
http://www.gmcmhphotos.com/photos/general-pictures/p58271-img-07761.html
http://www.gmcmhphotos.com/photos/general-pictures/p58269-fuel-system-q-jet.html
J.R. Wright
GMC Great Laker MHC
Newsletter Editor/Publisher
GMC Eastern States
GMCMHI
78 GMC Buskirk 30’ Stretch
75 GMC Avion (Under Reconstruction)
Michigan
> On Jun 30, 2015, at 7:01 AM, Lawrence Harrison wrote:
>
> I ended up pulling the fuel line off the carb and tested the delivery of fuel and it was pretty good streams of fuel. I replaced the fuel filter as
> Well and saw that the vinyl bushing was doubled up and seated near the back of the carb. The manual show the bushing before the filter. Though it
> slides through the filter so must seat behind the fuel filter. I will try adding 10 gallons of gas. My switch for tank selection does work and you can
> see the gauge moving from one mark to the other as use change the tank selection. I was wondering if perhaps my idle compensator valve could be bad or
> choke could be the concern. As I stated the carb seems like it starts starving for fuel upon stalling and if I squirt a bit of gas into the carb it
> automatically wants to stay running again. Also, on a cold start the next day the float bowl is empty of gas and BUT if you try pumping the gas after
> it stalls the ports push gas but that could be gas located in the pump area and not the float bowl. Amazing carb .... thanks for the input
> --
> 1974 Painted Desert
> 455 upper half rebuild
> constant project inexperienced mechanic
> Grand Rapids Mi
> Always trying to learn
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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