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Ford Truck Club Forum > FORD F-100 | F-150 SERIES > 1973-1991 Ford F150



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Old April 5th, 2019, 10:43 PM
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sbpbrent sbpbrent is offline
 

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Default Fuel leak in 78 F50 new to me

While I am waiting on a tow truck, I better ask some more knowledgeable people about this. I was out after work driving near my house. I noticed the smell of gas, the tank level began dropping more rapidly than normal, then the truck stalled and won't restart. There is fuel under the engine compartment somewhere. It's too dark to see at the moment, but tomorrow, where should I look first? The only thing to narrow it down at the moment, is it appears to be leaking at the front. Basics: 1978 F150 standard cab, 400M, manual transmission. Thanks in advance! (All this the day after it passed emissions).

Last edited by sbpbrent; April 5th, 2019 at 10:45 PM. Reason: spelling
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Old April 5th, 2019, 11:43 PM
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Fuel pump or a fuel line. Ethanol is rough on old fuel systems.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
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Old April 6th, 2019, 09:48 AM
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Interesting. I haven't found where it's leaking yet, but on LMC Truck I noticed that they have these listed:
Original material Pre-Bent Fuel lines.
Stainless Steel Pre-Bent Fuel Lines.

What's there looks like galvanized. Back to hunting and thanks! I will post some pics of my "new" truck after I get past this. I am not at all unhappy with it. Runs great and it:s pretty easy to work on (generally).
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Old April 6th, 2019, 10:14 AM
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It could possibly be a stuck float in the carb. Before you try to start it again, pull the dipstick and see if there's gas in the oil, that would indicate the fuel pump diaphragm.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
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Old April 6th, 2019, 08:32 PM
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It looks like the fuel pump, EVerything's dry downstream toward the engine. Upstream is wet on the pump and a couple feet beyond. Then it's dry to the tank. I expected the pump to be on top of the tank and I first thought the pump was the fuel filter. It looks easy to replace where it is.

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Old April 6th, 2019, 08:46 PM
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The fuel pump is an old school mechanical pump. The fuel filter is screwed into the carb inlet. The fuel pump diaphragm probably ruptured and the fuel was spraying out of the vent hole in the pump. Wouldn't hurt to do an oil change, good chance some gas got into the oil.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
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