| Re: [GMCnet] Gas tank reflective heat coating [message #318576] |
Tue, 06 June 2017 13:37  |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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Also - if there is pressure at the gas cap doesn’t that suggest that the vent system is inop?
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, CA
Howell EFI + EBL + Electronic Distributor
> On Jun 6, 2017, at 11:33 AM, James Hupy wrote:
>
> I used the correct gas cap. Read the service manual re: pressure in the
> fuel tanks and vented vs semi vented caps.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
>
> On Jun 6, 2017 11:20 AM, "Chris S." wrote:
>
> Side topic to the other threads going about vapor lock feedback. I've read
> here before about positive results on coating the fuel tanks with a heat
> reflective material, to help the tanks from absorbing road/engine heat. I
> believe that we have experienced fuel boil in the tanks last year in 93+
> degree temps on the Interstate highways. On the hottest days, the gas cap
> was making a noise and upon opening the cap, fuel actually gushed out.
>
> I figured it certainly can't hurt anything by doing this and I can see a
> number of benefits. To me, having the tanks under that much pressure sounds
> dangerous. Has anybody had positive results and what did you use?
>
> Thanks as always.
> --
> Chris S. -
> 77 Kingsley, 3.70 FD, mostly OEM -
> S.E. Michigan
>
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] Gas tank reflective heat coating [message #318578 is a reply to message #318576] |
Tue, 06 June 2017 13:41  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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You think?
Jim Hupy
On Jun 6, 2017 11:38 AM, "Larry Davick" wrote:
> Also - if there is pressure at the gas cap doesn’t that suggest that the
> vent system is inop?
>
>
> Larry Davick
> A Mystery Machine
> 1976(ish) Palm Beach
> Fremont, CA
> Howell EFI + EBL + Electronic Distributor
>
>> On Jun 6, 2017, at 11:33 AM, James Hupy wrote:
>>
>> I used the correct gas cap. Read the service manual re: pressure in the
>> fuel tanks and vented vs semi vented caps.
>> Jim Hupy
>> Salem, Or
>> 78 GMC ROYALE 403
>>
>> On Jun 6, 2017 11:20 AM, "Chris S." wrote:
>>
>> Side topic to the other threads going about vapor lock feedback. I've
> read
>> here before about positive results on coating the fuel tanks with a heat
>> reflective material, to help the tanks from absorbing road/engine heat.
> I
>> believe that we have experienced fuel boil in the tanks last year in 93+
>> degree temps on the Interstate highways. On the hottest days, the gas
> cap
>> was making a noise and upon opening the cap, fuel actually gushed out.
>>
>> I figured it certainly can't hurt anything by doing this and I can see a
>> number of benefits. To me, having the tanks under that much pressure
> sounds
>> dangerous. Has anybody had positive results and what did you use?
>>
>> Thanks as always.
>> --
>> 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
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] Gas tank reflective heat coating [message #318583 is a reply to message #318576] |
Tue, 06 June 2017 15:07 |
lw8000
Messages: 201
Registered: July 2012
Location: S.E. Michigan
Karma: 1
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Senior Member |
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ljdavick wrote on Tue, 06 June 2017 13:37Also - if there is pressure at the gas cap doesn't that suggest that the vent system is inop?
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, CA
Howell EFI + EBL + Electronic Distributor
> On Jun 6, 2017, at 11:33 AM, James Hupy wrote:
>
> I used the correct gas cap. Read the service manual re: pressure in the
> fuel tanks and vented vs semi vented caps.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
>
On that same trip, we stopped at the Co-Op and they checked over the fuel system including the venting ... all checked out OK.
Noted on the gas cap, I will check.
That said, based on some of the data collected with the temps of those tanks (due to a combination of multiple things), it sounds like the temps there can be lowered with some basic shielding. To me having the temps of the tanks reaching 140+ is only escalating the vapor lock issues.
Chris S. -
77 Kingsley, 3.70 FD, mostly OEM -
S.E. Michigan
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