[T3] On and off hard start FI 73 type 3 ?
Jaime
pr_ig at hotmail.com
Fri Jun 24 19:17:40 PDT 2022
Selling my two type three? Who can I contact?
Sent from my iPhone
> On Jun 24, 2022, at 7:47 PM, Keith Park <topnotch at nycap.rr.com> wrote:
>
> Ya know, and this has been dinner discussions at the invasions, but I never
> have ANY problems starting on the first stroke or 2 cold or hot, EXCEPT when
> 2 things happen,
> When the regulator lets the pressure go too high then it floods, and this
> was a discussion a month or so ago when Jim figured it out to be the threads
> getting corroded and not letting air in the regulator, and the second being
> when the backflow valve on the pump leaks down. When Jim rebuilt my pump
> the new bulletproof nylon valve did leak down, at least initially and I
> solved the problem with a separate back flow valve, inline with the hose,
> that he gave me. Now, pressure remains up for quite a while and comes up
> instantly when I turn the key on... no problems starting.
>
> Keith
>
>
> Topnotch Restorations
> topnotch at nycap.rr.com
> http://www.topnotchresto.com
> 71 Squareback "Hothe"
> 65 Notchback "El Baja Rojo"
> 93 RX7 "Redstur"
> 13 Subaru Outback "Blendin"
>
> -----Original Message-----
> From: type3-vwtype3.org <type3-vwtype3.org-bounces at lists.vwtype3.org> On
> Behalf Of Jim Adney
> Sent: Friday, June 24, 2022 10:25 AM
> To: type3 at vwtype3.org
> Subject: Re: [T3] On and off hard start FI 73 type 3 ?
>
> The question you never asked was, "Why does this happen now when it never
> happened when our cars were new." The short answer is, "I don't know, but I
> can guess."
>
> For what it's worth, my startup experience is EXACTLY the same as yours.
>
> When our cars were new, there was grey vinyl sleeving over all the FI hoses
> in the engine compartment. My GUESS is that this sleeving served as a bit of
> a heat shield, keeping those lines just a bit cooler in the heat soak after
> shutdown. When those hoses were replaced over time, the vinyl sleeves were
> thrown away, because the new hose was a bit too big to fit inside the
> sleeves and the vinyl may have shrunk a bit, too. It's also worth
> remembering that even when my '68 was new, I'd sometimes turn the key ON and
> OFF a few times to make starting easier. Later FI engines tended to run
> richer and cooler, but they had the same thermostat, so I'd expect the heat
> soak to be the same.
>
> Back in the day, I bought a roll of the sleeving from VW, but it came in
> black rather than grey. I figured that black would not be as good a heat
> shield as grey, and the hose I had at the time was still too large to fit
> inside it, so I never tried it. I have smaller hose now, so I might try it
> next time I replumb an engine, but the primer switches work great, so
> there's little incentive to look for a solution that still needs some use of
> the primer switch.
>
> Jim
>
>> On 23 Jun 2022 at 15:31, William Jahn wrote:
>>
>> I have a prime switch and use it until I hear no more air then cycle
>> the key once pump the pedal once and most of the time it starts fine.
>> Sometimes it will start then quit yet I try the key again and it starts
> right up.
>> Once it starts I can drive it and shut down and it always starts right up.
>>
>> I drove it yesterday and it started fine , today it quit once then
>> started.
>>
>> I replaced the fuel pressure regulator back in the mid 90's yet even
>> the original worked fine , never had any issues starting or air in the
>> fuel lines where I needed a primer switch I just turned the key and
>> it fired right up.
>>
>> I have checked everything and have power to the ECU from the power
>> relay and the pump relay always times out every time. The connector
>> that feeds the ECU from the power relay is clean and tight. I
>> replaced the fuel pump with a 2 port type and it's been fine. I also
>> replaced the fuel filter and don't have many miles since both were
>> done. Not long ago I took apart the power relay and cleaned the
>> contacts and replaced the ground wire since half of the 1/4 " female
> crimp was missing.
>>
>> All I can think of is that the fuel pressure regulator is bleeding
>> down overnight. The fact that once it's started then runs and starts
>> right up every time after tells me it's not a wiring issue.
>>
>> The odd part is usually if it starts and tries to die if I feather
>> the throttle it will keep running. It's when it starts and runs for a
>> minute or so then just quits that has me baffled. This has only happened a
> few times.
>>
>> William
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>
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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