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Home » Public Forums » GMCnet » [GMCnet] In tank fuel pumps, or external pumps.
Re: [GMCnet] In tank fuel pumps, or external pumps. [message #316382 is a reply to message #316379] Fri, 21 April 2017 10:30 Go to previous messageGo to previous message
emerystora is currently offline  emerystora   United States
Messages: 4442
Registered: January 2004
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That should have read 1993 Jeep, not 1973.

Emery Stora

> On Apr 21, 2017, at 9:21 AM, Emery Stora wrote:
>
> Gasoline does not have to boil to cause vapor lock. It just has to vaporize. Liquids can change to a vapor well below their boiling point. Just look at the roads after a rain. The water dries up from the road by changing to a vapor into the air and yet the surface of the road is not at 212 degrees, the boiling point of water.
>
> I had an external electric pump just outside my tanks but still got vapor lock at times, especially at the high altitudes here in Colorado.
>
> I installed the in-tank pumps in 2010 and have not had any vapor lock since. They now have about 8 years on them and no failures. I probably put more miles on each year than most of you. I have gone to Michigan and to Florida each year plus most of the GMCMI conventions.
>
> My feeling is that if a pump should ever fail on a trip I can get by with one pump or I could easily mount a pump outside the frame rail where it used to be and pull through the failed pump if I am 2000 miles from home and don't want to fill as often.
>
> It will be interesting to see how many years the pumps last.
>
> The in-tank pump in my 1973 Jeep Grand Cherokee never failed in the 20+ years I owned it (over 200,000 miles) so in-tank pumps seem to last a long time. I think people's fears of pump failure are overrated. Of course it can happen but it's a risk I can accept. My pumps are Airtex. I would not buy cheaper pumps.
>
> Emery Stora
> 77 Kingsley
> Frederick, CO


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