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PRMN944
Join Date: Oct 2007
Location: Portland, OR
Posts: 117
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Car runs sluggish after full tank of gas
Whenever I filled up my gas tank on my '83 944, the car does not accelerate well or very sluggish performance.
When gas tank near empty, the car runs better. I do not seem to understand these problem. Does anyone ever replace the fuel screen inside the fuel tank ? |
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11-29-2007, 01:03 AM
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Certified Rennwerker
Join Date: Oct 2002
Location: Kansas
Posts: 1,906
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May sound like a simple minded answer but 1 gallon of fuel weighs 8 pounds...IIRC, take that times 14 gallons and you have added a whopping 112 more pounds to pull! This is the least expensive advice you will get to increase HP usage!
 Dal
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PCA " I've been everywhere, done everything......just can't remember any of it!" 
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11-29-2007, 05:32 AM
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Quality
Join Date: Oct 2007
Location: Philadelphia area and Morristown NJ
Posts: 951
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Weak fuel pump can't perform well under pressure? ... That's even weaker than 924Sman advice... but may also be valid?
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85.5 944 NA 5spd - Sold but not forgotten 89 951 Turbo S - Revival in progress... 
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11-29-2007, 06:11 AM
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Registered
Join Date: Oct 2006
Location: Michigan
Posts: 383
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You might want to check your fuel filter.
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2006 Porsche Cayman S 2006 Lotus Exige (Sold) 1986 Porsche 944 (Sold) 1981 Porsche 931 (Wrecked) 1987 Porsche 944 (Sold) |
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11-29-2007, 06:37 AM
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Registered
Join Date: Jun 2003
Location: Phoenix, AZ
Posts: 1,327
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Quote:
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87 951, K27/6, Almond Beige, 17" Turbotwist 87 944S, alpine white, 5sp died a violent death 84 944, silver/brown, auto, gone but not forgotten "may the force be with you" |
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11-29-2007, 07:29 AM
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PRMN944
Join Date: Oct 2007
Location: Portland, OR
Posts: 117
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I remember when I check the fuel pressure, it was at the right range.
Perhaps , I should recheck the fuel pressure when the gas tank is full. Thanks for the fuel pump and fuel filter inputs. |
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12-03-2007, 12:35 AM
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Certified Rennwerker
Join Date: Oct 2002
Location: Kansas
Posts: 1,906
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Ok 6 lbs. then, thanks.
Dal
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PCA " I've been everywhere, done everything......just can't remember any of it!"
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12-03-2007, 03:44 AM
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Registered
Join Date: Jan 2007
Location: New Hope, PA
Posts: 53
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Quote:
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Daryl 85.5 944 Status: [ ] running [X] broken |
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12-06-2007, 06:25 AM
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Certified Rennwerker
Join Date: Oct 2002
Location: Kansas
Posts: 1,906
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After some thought, it could very well be the check valve in line of the FP.....?
Dal
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PCA " I've been everywhere, done everything......just can't remember any of it!"
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12-06-2007, 06:28 AM
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Registered
Join Date: Nov 2006
Location: Raleigh, NC
Posts: 259
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My guess is that it's a tank venting problem. If it was a pump or filter issue, I wouldn't think it would matter if you had a full tank or empty. Like Daryl said, try driving it without the gas cap and see if that helps.
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Dan Former owner of: '88 924LE (Luddite Edition) manual steering, manual sunroof, manual windows, AC delete, cruise delete, M030 Konis, 25.5 torsions, 931 valance and header panels, 6X16 Fuchs, lowered, etc, etc. |
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12-06-2007, 07:47 AM
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Certified Rennwerker
Join Date: Oct 2002
Location: Kansas
Posts: 1,906
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I agree^^ but the best answer is it could be anything!
Dal
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PCA " I've been everywhere, done everything......just can't remember any of it!"
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12-06-2007, 07:58 AM
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Registered
Join Date: Nov 2006
Location: Raleigh, NC
Posts: 259
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Yes, it could be anything, but it definitely is something. ....... Well, that's just a guess, anyway.
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Dan Former owner of: '88 924LE (Luddite Edition) manual steering, manual sunroof, manual windows, AC delete, cruise delete, M030 Konis, 25.5 torsions, 931 valance and header panels, 6X16 Fuchs, lowered, etc, etc. |
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12-06-2007, 08:46 AM
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PRMN944
Join Date: Oct 2007
Location: Portland, OR
Posts: 117
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I bought a new aftermarket gas cap from GI 'S Joe last year . It was non locking type.
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12-08-2007, 11:33 PM
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Registered
Join Date: Jan 2007
Location: New Hope, PA
Posts: 53
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Quote:
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Daryl 85.5 944 Status: [ ] running [X] broken |
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12-09-2007, 07:05 AM
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PRMN944
Join Date: Oct 2007
Location: Portland, OR
Posts: 117
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Please allow me to apologized to all fellow 944s for not getting back to the thread soon.
Just did not have the extra time . Anyways, I jus t replaced my fuel filter and done fixing the leaking oil cooler. I will get the OE gas cap and probably an oxygen sensor too since this old tired 944 is acting bad now because it is very cold in Portland. |
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12-14-2007, 10:47 PM
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What would Darth Vader do
Join Date: Feb 2001
Location: Orange, California
Posts: 1,324
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You might want to look at the type of "gasoline" you are using. These cars do not do well on corn blended fuel. I recently changed back to Chevron due to my cars inability to use the cheaper fuels. I checked with the local Porsche dealership.
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1983 944 (2002 to now) 3-924's (Sold) 1967-912 (Traded) NEVER put a used water pump in your car... |
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12-15-2007, 01:40 PM
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PRMN944
Join Date: Oct 2007
Location: Portland, OR
Posts: 117
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In the past, I used Shell sometimes 76. But, currently using Chevron 89 grade.
Where I live now , from November through February the gas stations mixed Ethano with the gas. |
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12-15-2007, 09:54 PM
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