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Mod | | | Forums66 Topics128,088 Posts1,056,408 Members48,443 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Mar 2007 Posts: 35 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2007 Posts: 35 | The fuel pump on my 6 cyl 270ci gmc motor is spittin' fuel out of a small hole located in the base of the pump, down where the mounting bolts are. It's a factory hole, diameter is about the size of the lead in a pencil. Not sure why it's there, no idea why it would be spittin' out fuel when it's running- any ideas?
53 Chevy 210 convertible; 55 GMC pickup; 57 GMC Suburban Carryall
| | | | | Joined: Aug 2005 Posts: 6,377 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,377 | Likely a small split in the diaphragm. Replace it before it leaves you stranded.
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
| | | | | Joined: Mar 2007 Posts: 35 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2007 Posts: 35 |
53 Chevy 210 convertible; 55 GMC pickup; 57 GMC Suburban Carryall
| | | | | Joined: Oct 2013 Posts: 331 Shop Shark | | Shop Shark Joined: Oct 2013 Posts: 331 | Just to clarify - that hole is there to tell you your pump is leaking. It's a telltale weep hole. All mechanical fuel pumps have one.
1950 4100 - unrestored and driven weekly for almost no reason at all.
| | | | | Joined: Mar 2005 Posts: 1,636 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 1,636 | Make sure you check your engine oil for fuel smell. If any doubt, change it and the filter. | | | | | Joined: Mar 2007 Posts: 35 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2007 Posts: 35 | Thanks to all, definately learned something today!
53 Chevy 210 convertible; 55 GMC pickup; 57 GMC Suburban Carryall
| | | | | Joined: Dec 2008 Posts: 87 'Bolter | | 'Bolter Joined: Dec 2008 Posts: 87 | I let my carb sit with Ethanol and had issues after. If you drive your vehicle daily "im told" you won't have issues but if it sits you may consider using ethanol free fuel.
1938 Chevy 1/2 ton Pickup
1940 Chevy 3/4 KD Pickup
1946 Chevy 3/4 ton pickup
1940 Chevy 1/2 KC Pickup
1939 Chevy 1.5 Truck
| | | | | Joined: Sep 2008 Posts: 872 Shop Shark | | Shop Shark Joined: Sep 2008 Posts: 872 | Umm... if its a mechanical fuel pump there is no need to vent it.. the base (with the arm) is open to the interior of the block, which IS open to atmosphere (via the PCV or simple draft tube).
Also, the location of this weep hole is not at the lowest point or any point where fuel would readily pool to indicate a problem.
Is there anything in a shop manual about this hole????? Just curious. | | |
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