[ROVERNET - UK] 3500S intermittent power loss
Kent Kinard
kkinard at wcc.net
Tue Sep 18 01:26:08 BST 2007
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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