[ROVERNET - UK] 3500S intermittent power loss

Tue Sep 18 02:13:50 BST 2007

Ahh I forgot, check the reserve tap.  If it is halfway (which often happens 
when they aren't used for years, then is once, it doesn't return properly), 
it produces fuel starve.

PVS

----- Original Message ----- 
From: "Kent Kinard" <kkinard at wcc.net>
To: <rovernet at lyris.ccdata.com>
Sent: Tuesday, September 18, 2007 10:26 AM
Subject: Re: [ROVERNET - UK] 3500S intermittent power loss

> Yes, it does sound like a fuel starvation problem.  These thoughts are off 
> the top of my head.
> 1)I think the fuel pump has an internal filter.  It's been a while since I 
> worked on mine.
> 2)I do remember the nightmare with the pickup screen that is part of the 
> in-tank sending unit and reserve fuel petcock arrangement.  Draining the 
> tank and checking this is a very messy job.  Perhaps save that chore for 
> last if nothing else helps.
> 3)Check the evaporative emissions and condensate arrangement, as a plugged 
> evap line can give these symptoms.  If you drive a while and experience 
> the problem, try opening the gas cap and see if you get a sucking sound 
> that would indicate high vacuum in the gas tank.  Alternatively, drive 
> with the gas cap open and see if the problem persists.  I think I would 
> try this first, since it's easiest.  It's really hard for the pump to draw 
> fuel against a vacuum.
>
> Roverly,
> Kent K.
>
> On Tue, 18 Sep 2007 09:23:56 +1000
>  "Netspace" <vmitps at netspace.net.au> wrote:
>> I agree, fuel pump and clean the fuel lines.
>>
>> ----- Original Message ----- From: "Brooks" <restore at nbnet.nb.ca>
>> To: <rovernet at lyris.ccdata.com>
>> Sent: Tuesday, September 18, 2007 7:50 AM
>> Subject: Re: [ROVERNET - UK] 3500S intermittent power loss
>>
>>
>>> It sounds a lot like a problem with the electric fuel pump.
>>>
>>>
>>> ----- Original Message ----- 
>>> From: "Christopher Smith" <csmith at ssl.berkeley.edu>
>>> To: <rovernet at lyris.ccdata.com>
>>> Sent: Monday, September 17, 2007 6:19 PM
>>> Subject: [ROVERNET - UK] 3500S intermittent power loss
>>>
>>>
>>>>
>>>> Hi Folks
>>>>
>>>> I have been a long time lurker and occasional poster on this list for a 
>>>> long time and I have a question concerning a problem with my 1970 
>>>> 3500S. I have convinced myself it is suffering from fuel starvation but 
>>>> I don't know what I'm talking about so I thought I would ask the group. 
>>>> Maybe someone has experienced this same problem.
>>>> I bought this car a few years back and have been struggling recently to 
>>>> get it back on the road. I am now driving it to work daily but it is 
>>>> intermittently losing power. Here are the symptoms I have gathered so 
>>>> far:
>>>> - It drives fine around town but when I get on the highway and drive 
>>>> for a bit, maybe 1/2 mile, it suffers a drastic loss in power if I'm at 
>>>> moderate throttle or greater. If I take my foot off the gas for a bit 
>>>> and then accelerate again power returns for a bit and then disappears 
>>>> again.
>>>> - On the highway this only happens going up a hill or where I have been 
>>>> using moderate throttle for a while.
>>>> - If I down shift the problem persists at the higher RPM.
>>>> - I can also get this to occur at lower RPM if I go up a long steep 
>>>> hill with wide open throttle.
>>>> - It doesn't appear to be temperature related since I can get right on 
>>>> the highway and lose power in about a half mile of accelerating while 
>>>> the engine is relatively cool.
>>>> - I put a new fuel filter in this morning with no effect.
>>>> - The vacuum advance is disabled at the moment, parts are on order, but 
>>>> Im thinking this isn't the problem since it is so intermittent  ...
>>>>
>>>> Any thoughts?
>>>>
>>>>
>>>> Chris
>>>> Northern California, USA
>>>> 1970 3500S P6b
>>>>
>>>>
>>>> -- 
>>>> Christopher L. Smith
>>>> Thermal Engineer
>>>> Space Sciences Lab - U.C. Berkeley
>>>> Addition, Room #235
>>>> Phone: 510-642-2461
>>>> Cell: 510-301-7541
>>>> Fax: 510-643-4478
>>>> Email: csmith at ssl.berkeley.edu
>>>> www.ssl.berkeley.edu
>>>> SSL Spam Check: AST:7731^29u18e3
>>>>
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>>>
>>>
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>>
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>
>
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