[T3] Mechanical Fuel Pump Vapor Lock

[Keith Park]

Ahh, a whole block, I was thinking that hesitation that’s common a few
seconds after starting it.  One thing ive never had a problem with even with
today's gas is the stock fuel pumps, but I have on occasion had something
get in the valve and screw It up, you might want to take it all apart, clean
it all up and then try it, so long as the Bakelite base is in place, and it
would have to be, the pump should be OK.  Are you using the little one-way
fuel cutoff valve or the electromagnetic ones on the carbs themselves?

Keith


Top Notch Restorations
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http://www.a383ina68.addr.com/radiorest/main.htm
71 Squareback "Hothe"
65 Notchback "El Baja Rojo"
65 Squareback "Eggcrate"
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93 RX7 "Redstur"


-----Original Message-----
From: type3-vwtype3.org-bounces at lists.vwtype3.org
[mailto:type3-vwtype3.org-bounces at lists.vwtype3.org] On Behalf Of Adam
Douglass
Sent: Wednesday, January 22, 2014 3:09 PM
To: type3 at vwtype3.org
Subject: Re: [T3] Mechanical Fuel Pump Vapor Lock

Keith,

Starting is not a problem. It is after it runs for a block or so that I get
starvation and stumble. Then it takes a few seconds and it is back to
normal.

This is why I do not think it is locking at the carbs; but rather the fuel
pump.

Adam



On Wednesday, January 22, 2014 11:43 AM, B Fye <bfye at canyonville.net> wrote:
 
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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