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08-09-2008, 12:19 AM
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#1 |
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Registered User
Join Date: Apr 2008
Location: Phoenix Arizona
Posts: 13
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Mechanical Fuel Pump Question
New chevy truck owner (70 SWB 4x4 with a 454 motor) with a newbie question. I took my truck for a ride last night and this moring I walked into the garage and found puddle of fuel under fuel pump, upon further investigation found what looked like the fuel pump seaping fuel from the upper seam. My question is why would fuel be seaping from the fuel pump without the truck running? FYI After replacing the fuel pump the issues did go away. Is there any other things that could have caused this. Thanks in advance for your help.
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08-09-2008, 12:27 AM
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#2 |
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Built 4 Speed
Join Date: May 2008
Location: Geneva FL
Posts: 619
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Re: Mechanical Fuel Pump Question
more than likely its just a seal gone bad and gravity just pulls things down our gas tanks are higher than the pump so its a bit of pressure on it even when its not running.
your problem is not unique i have seen this in a few threads. just one of those things i guess.
__________________
1969 C/10 Short Box: 496/T-56 in worx.  "To Be Old And Wise, First You Must Be Young And Stupid" |
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08-09-2008, 12:29 AM
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#3 |
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Gone to greener pastures
 Join Date: May 2007
Location: Gateway to the Delta
Posts: 7,354
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Re: Mechanical Fuel Pump Question
If the pump has a bad diaphragm, it will leak fuel out the "weep" hole in the pump body, rather than allowing fuel to leak into the crankcase.
That keeps the gasoline from diluting the engine oil and causing high $ damage.
__________________
'69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck |
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08-09-2008, 04:37 PM
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#4 |
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Registered User
Join Date: Apr 2000
Location: Bonne Terre, Mo
Posts: 3,005
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Re: Mechanical Fuel Pump Question
Much better external than internal. Well said EL JAY.
__________________
'69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629" |
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08-12-2008, 02:52 PM
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#5 |
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Registered User
Join Date: Jan 2007
Location: Topeka,KS
Posts: 778
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Re: Mechanical Fuel Pump Question
You should check/change your oil too.
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08-12-2008, 02:56 PM
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#6 |
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Registered User
Join Date: Dec 2004
Location: Northern AZ
Posts: 7,270
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Re: Mechanical Fuel Pump Question
Might just be a leak at the fuel line fitting running onto the top of the pump, but for the $10-12 cost of a new pump, swap it and be sure. As said above pull the dipstick and make sure the oil does not smell like fuel.
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