Hi all. I have developed a pretty good oil leak. However, I cannot determine exactly where it is coming from. I did notice that when I pulled the dipstick, the oil smelled like gasoline. I ran the truck and warmed it up good and again inspected for where the leak was coming from and could not find it. Lot of oil blown across the bottom half of the engine and oil pan. I drained the oil and it wreaked of gasoline. What would cause gasoline to be getting in the oil?
Mechanical fuel pump diaphragm has a crack and pumping fuel into the engine. Age of pump and also today's fuel can cause this. Avoid today's new fuel pumps, visit Then and Now Automotive for repair of current pump. Advise not to drive. I had this to occur, one side effect is it tends to remove engine sludge upon draining oil.
Send your original fuel pump to Then and Now Automotive for a rebuild. New ones aren't worth a plug nickle.
They rebuilt mine a year or so ago and I've put many thousands of miles on it.
If your fuel pump is a new pump, find an original pump or one built in the USA 30 years or more ago and send it to T&N.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
Ditto on the leaky fuel pump. Most fuel pumps have a hole in the lower housing that lets at least most of the leak vent to the outside before it makes its way into the crankcase. That also accounts for the oily residue along the bottom of the engine. Air blowing over the fuel pump housing pushes the leak back along the oil pan. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
Thanks all. I have the fuel pump off. It is a Carter MO 735 Made in the USA. Is it one that is worth having rebuilt by Then and Now Automotive? If not, what are my options since it looks like buying a new one is a waste of money? I've attached pictures of the current one I have.
Yes, they'll be able to do it. They only take calls on Monday and Thursday so you'll have to wait to speak with them. They are way behind and short handed. It took them 2 months to do a Cadillac pump for me recently. Works like a champ, though.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
As I understand it, one of the problem with today's fuel pumps is the actuator arm with its mate to the cam and movement of the pump diaphragm. Repair of your pump seems feasible. I looked up pump number on their web site, ordered it's kit and rebuilt mine. First time I rebuilt one, works great for past 3 years.
I believe Then and Now also sells the rebuild kits if you don't want to wait and are confident doing it yourself. I agree with everyone about rebuilding and not buying a new aftermarket. There are probably other options besides Then and Now but I am on my 3rd after market fuel pump. When I got my truck, it did not have a fuel pump and this is before I new about the issues of the after market pumps. With less than 2 hours run time the first pump failed. I bought a second pump. Less than 10 hours of run time and failed. I am on my third fuel pump. So far, so good. If this one fails I am going to source an original and have it rebuilt, or go 100% electric.
