What is this?
Lead Driver
Joined: Nov 2013
Posts: 7,180
Likes: 1,174
The base of the fuel pump is connected directly to the side of the crankcase. The fuel pump should have an internal seal to keep out the oil. If that seal has failed, oil could escape that way.
FTE Legend
Joined: Nov 2015
Posts: 30,940
Likes: 4,125
From: Angier, NC
I take it this is a V8 gas motor?
Only thing I can think of would be a valve cover gasket. If valve cover you should see oil leaking down the head & block onto the fuel pump.
When fuel leaks out it can mix with grease & dirt and look like oil.
Next time it leaks test it with your finger to see what it feels like then smell it. I bet it is fuel.
Dave ----
Only thing I can think of would be a valve cover gasket. If valve cover you should see oil leaking down the head & block onto the fuel pump.
When fuel leaks out it can mix with grease & dirt and look like oil.
Next time it leaks test it with your finger to see what it feels like then smell it. I bet it is fuel.
Dave ----
FTE Legend
Joined: Nov 2015
Posts: 30,940
Likes: 4,125
From: Angier, NC
Also know fuel pumps can leak fuel into the oil - not a good thing.
Dave ----
Trending Topics
Lead Driver
Joined: Nov 2013
Posts: 7,180
Likes: 1,174
To check for the possibility of fuel leaking into the crankcase, pull the dipstick and take a sniff. Any fuel smell indicates fuel has already mixed with the oil. Even if you don't smell fuel, it's a reasonable precaution to change the oil after replacing a pump that was leaking.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 40
From: EXTREME southwest CT
If it was a leak on the suction side the pump would be "sucking wind" and the engine would not run because the pump would not prime.
If the diaphragm fails fuel will get in the crankcase and the oil level will be way too high (and watery)
Clean everything up with degreaser and detergent, then watch for the leak as someone else starts the truck.
You should be able to pinpoint the leak right away.
If the diaphragm fails fuel will get in the crankcase and the oil level will be way too high (and watery)
Clean everything up with degreaser and detergent, then watch for the leak as someone else starts the truck.
You should be able to pinpoint the leak right away.
Mountain Pass
Joined: Aug 2016
Posts: 173
Likes: 0
From: Meridian ID
I had similar issues, mysterious oil leaks and dripping. My solution was a new pcv valve!
I had tuned up my beastie but forgotten the little plasticky rascal, replaced it and literally dried up 95% of my drips!
Just throwing in my .02 cause I has dirty drips like this.
I had tuned up my beastie but forgotten the little plasticky rascal, replaced it and literally dried up 95% of my drips!
Just throwing in my .02 cause I has dirty drips like this.
Thread
Thread Starter
Forum
Replies
Last Post
hershambob
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
3
May 8, 2012 11:54 AM
fordfan28
Fuel Injection, Carburetion & Fuel System
1
Aug 24, 2007 05:06 AM
eldomike
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
2
Mar 12, 2004 07:58 AM