[T3] Mechanical Fuel Pump Vapor Lock

[B Fye]

4psi is too much!  2.5 to 3 is all you need.  More than that and fuel pushes past the floats.

Brian Fye

> On Jan 22, 2014, at 10:03 AM, Adam Douglass <one4house at yahoo.com> wrote:
> 
> Jim,
> 
> My car does not have chokes, so we can put that one to bed. I do agree that it should clear out the fuel pump a lot quicker, but it definitely acts like fuel starvation. The only thing I can figure out is that the hot air of the motor rest under the hatch and heats the fuel pump. If it were a carb issue it would not start when hot.
> 
> I was thinking of doing the Mr Gasket 12S fuel pump and Summit SUM-890145 inertia switch. The fuel pump is a 4 to 7 lb model. The inertia switch looks like a copy of the Ford inertia switches used in the 90's. Let me know what you think.
> 
> Adam
> SUM-890145
> 
> 
> 
> On Wednesday, January 22, 2014 8:31 AM, Jim Adney <jadney at vwtype3.org> wrote:
> 
> On 22 Jan 2014 at 6:56, Adam Douglass wrote:
> 
>> I have read that type 3 cars are prone to fuel pump vapor lock on hot
>> restart. My car does this. It will start fine when hot, but once the
>> carbs run out of fuel it will sputter and choke till the fuel pump
>> clears itself of the vapor and pumps fuel. 
> 
> I'd expect the fuel pump to clear itself quite quickly. Is there any 
> possibility that what you are experiencing is that the electric 
> chokes are mis-adjusted and have closed a bit in the short time 
> they've cooled down? That might give the same symptoms.
> 
>> My thoughts were to remove the mechanical pump and go electric. I was
>> thinking of putting in a low pressure fuel pump this weekend. Are
>> there any other solutions? 
> 
> I don't think most carbed Type 3s have this problem, but the solution 
> I would suggest would be to install one of those small electric fuel 
> pumps under the gas tank, up front. You can even leave the stock pump 
> in place if it's not causing other problems. They will run okay in 
> series without doubling the fuel pressure.
> 
> BUT, for safety's sake, you should also install an impact switch in 
> the electrical feed to the new pump, to make sure that the pump won't 
> keep running after an accident. IIRC, those are available at NAPA as 
> Ford replacements for under $30. Mount it rigidly to the body, under 
> the dash, somewhere you can get to it fairly easily to reset it if 
> necessary.
> 
> -- 
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> 
> *******************************
> 
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