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The 48 has a leak some where in the location of the fuel pump..I tried to get a drip at idle but not enough RPM's..Any ideas other than ripping everything apart?? 
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Joined: Dec 2001
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Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
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I think it is from the fuel pump. The shaft may be worn and it leaks out the shaft holes, or it could be the diaphragm??? Fuel pump mounting bolts may be loose.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Thanks Ray,I start there..when replacing the gasket , is sealant recommended?
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Technical Advisor ChatMaster - 10,000
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Depending on which type gasket I have, if the thin stiff one I would use some sealer on it. If a thick cork type it is probably not needed. PS: Wipe under the fuel pump and see if you pick up oil.
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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I wiped every thing down today after my tour..No oil now..I will change the pump and start there
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...."No oil now"....Check your oil level 
-BowTie Bob
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CC, It is refreshing to note that you 47/48 Fleetliners have the same problems as the rest of us. How dare that engine leak oil! I think Chipper has given good advice. The vent is close by. You may want to check that as well. There are a lot of places it could be coming from so check the lower side pan. Some bolts may be loose. As a fix, you may tie a bath towel around the fuel pump. It will absorb a heap of oil and you can toss the towel after use and go into the house and just grab another one. Easy. When the missus asked if you know where the bath towels are disappearing to, you just merely say that you don't have a clue.  You are welcome, Charlie  BTW: Be sure to tuck and tie the ears of the towels up so they don't show below the eye-views from the outside of the car. If you don't other 47/48 Fleetliners will gasp and may shun you. Non-47/48 Fleetliners will point and giggle. Oh, the shame!
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Charlie I am pretty sure the oil is coming from the lower part of the fuel pump..Still working on replacement...Real hard to get a wrench on the left mounting bolt...Got to find sometime..Turned into more than a 20 min.project...But you know us Fleetliners..We are real fussy about how it looks when all done
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CC, Yes, fuel pumps are a bitch to put on. All owing to having to overcome the pressure of the cam on the arm and the dang closeness of the bolt heads to the housing. They could have engineered a little more space on the bolts, at least. Yes, I know how fussy you 47/48 Fleetliners are. That is as it should be. Nothing wrong with the epitome of a fleet line: A two-toned, two-door Fleetline Aerosedan is truly a beautiful car. (Hep me! I need some smelling salts. I have fainted and can't get up!) Charlie BTW: What was considered the best two-tone paint combination for those cars?
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Charlie I will accept that as a complment?Mine is solid Mayland Black,but if I had another choice for a 2 tone it would be Dove Gray body and Battle Ship Gray top....... I finally drug the old body under the car and found that a pin towards the bottom of the fuel pump had worked its way out,in the way of the left bolt"could not see working from at the top"After pushing it back the bolts now can both be tightened or removed with a socket from up above... 
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Technical Advisor ChatMaster - 10,000
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The bolt you are talking about is probably the pump arm pivot pin. It is common for that pin to wear and cause a leak. The remedy is to replace the fuel pump with a new or rebuilt.
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Nov 2007
Posts: 476
Backyard Mechanic
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Backyard Mechanic
Joined: Nov 2007
Posts: 476 |
The oil leak is most likely the fuel pump lever pivot pin, as mentioned by Ray.
I've had good success in stopping the leak by removing the pump, cleaning both sides of the pump body where the ends of the pivot pin exit, thoroughly, using acetone to remove all trace of oil, then putting a generous dab of silicone sealant (I'd use the black or copper grade) over the exposed ends of the pivot pin, making sure that the silicone is fully adhered to the pump body and the ends of the pin. Allow to dry 24 hours before re-installing.
When you reinstall the pump, if you use socket head (Allen head) bolts in place of the hex head bolts, you'll find it a little easier to remove/install the pump.
Also, when installing, if you're fighting the pump lever spring, jog the motor just a bit to get the fuel pump cam lobe onto the base circle.
Mark
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Thanks guys...Makes lots of sense...I will replace the whole unit and fix the old one as a backup
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