For any pump to pull through and push is not the issue.
When gasoline is drawn through the filter, there is a differential pressure
created that invites vapor pockets.
To avoid that to some degree, we use high capacity filter cartridges that
has lower pressure drop.
Larger capacity has 3-4 times more media area so the particulets are spread
out on the media to where the restriction climbs up at a much slower rate.
> I have been over this on the net, and done presentations at several rallies
> on the West Coast about what many here describe as vapor lock. Don't know
> if that is an exact term or not, but, for those of you out there in
> GMCVILLE who are having issues with driveability of their coaches on days
> warmer than 85 degrees or so, I will try to aproach how to deal with it,
> not what causes it.
> 1. Get rid of your winter fuel.
> 2. Run with your tanks as full as possible.
> 3. Drive early in the day when it is cooler.
> 4. Keep your filters clean, carry spares.
> 5. Install an inline electric fuel pump after the selector valve.
> 6. Use ethanol free fuel if possible.
> Most of the time, this is all that is needed. The problem is NOT WITH YOUR
> COACH. IT IS WITH THE FUEL. So, fixing the coach is NOT going to make your
> problems go away totally.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
>
>
> > I second the little Qjet filter only takes a little shmoots that will
> cause this same issue. It may not be your issue but they are cheap and I
> > keep a few in the glove box and replace from time to time. Even though my
> fuel system has been redone ie. tanks sealed,fuel lines replaced etc . I
> > too have aux carter and hit it when she starts to stumble seems to help
> but it has done it to me even with the aux pump on. Has anyone had any luck
> > with the 3 port/return line mechanical pump the Toros had on them to
> remedy VL ?
>
>
> We ended up also installing an inline metal filter between the metal line
> and fuel pump inlet to help keep stuff from getting to the pump, just in
> case. Super easy to change out if needed, and is a little larger than the
> one at the carb. For what it's worth.
> --
> Chris S. -
> 77 Kingsley, 3.70 FD, mostly OEM -
> S.E. Michigan
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> _______________________________________________
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> Unsubscribe or Change List Options:
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>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
When gasoline is drawn through the filter, there is a differential pressure
created that invites vapor pockets.
To avoid that to some degree, we use high capacity filter cartridges that
has lower pressure drop.
Larger capacity has 3-4 times more media area so the particulets are spread
out on the media to where the restriction climbs up at a much slower rate.
> I have been over this on the net, and done presentations at several rallies
> on the West Coast about what many here describe as vapor lock. Don't know
> if that is an exact term or not, but, for those of you out there in
> GMCVILLE who are having issues with driveability of their coaches on days
> warmer than 85 degrees or so, I will try to aproach how to deal with it,
> not what causes it.
> 1. Get rid of your winter fuel.
> 2. Run with your tanks as full as possible.
> 3. Drive early in the day when it is cooler.
> 4. Keep your filters clean, carry spares.
> 5. Install an inline electric fuel pump after the selector valve.
> 6. Use ethanol free fuel if possible.
> Most of the time, this is all that is needed. The problem is NOT WITH YOUR
> COACH. IT IS WITH THE FUEL. So, fixing the coach is NOT going to make your
> problems go away totally.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
>
>
> > I second the little Qjet filter only takes a little shmoots that will
> cause this same issue. It may not be your issue but they are cheap and I
> > keep a few in the glove box and replace from time to time. Even though my
> fuel system has been redone ie. tanks sealed,fuel lines replaced etc . I
> > too have aux carter and hit it when she starts to stumble seems to help
> but it has done it to me even with the aux pump on. Has anyone had any luck
> > with the 3 port/return line mechanical pump the Toros had on them to
> remedy VL ?
>
>
> We ended up also installing an inline metal filter between the metal line
> and fuel pump inlet to help keep stuff from getting to the pump, just in
> case. Super easy to change out if needed, and is a little larger than the
> one at the carb. For what it's worth.
> --
> Chris S. -
> 77 Kingsley, 3.70 FD, mostly OEM -
> S.E. Michigan
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
