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Gregory1234 Samba Member
Joined: December 29, 2012 Posts: 9 Location: Southampton
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Posted: Wed Jun 16, 2021 8:01 am Post subject: 1972 Bus - Fuel in Oil |
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Hello there! I am a recent owner of a 1972 Campmobile! As fun as it has been, I've run into a bit of trouble, mostly concerning a troubling fuel-in-oil problem I have. Please bare with me, I am a not very experienced beginner!
The previous owner at some point converted the stock engine to a Weber 32/36 DFAV with an electric pump with only a patent number printed on it. The engine was running extremely rich, and attempting to adjust the carburetor did not seem to work at all. I was worried that the pump was pushing more than what the carburetor could handle. Sometime later, I removed the dipstick and smelled a very strong fuel smell, as well as the oil level being way too high.
I installed a Holley pressure regulator that was recommended by someone on this site. I also had the carburetor rebuilt, which was a fun experience!
I'm not sure if the pressure regulator is working, the carburetor was still not adjusting properly. After flushing the old oil out, and after running it for awhile, I noticed that the oil smelled like gas again. Go figure! I am wondering whether or not to just replace the pump as well..
If anyone has any input on this, I would greatly appreciate it! I have little knowledge what I am talking about, so I apologize if I messed some wording up. Thank you for reading! |
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Jrh5r Samba Member
Joined: January 08, 2021 Posts: 33 Location: East coast
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Posted: Wed Jun 16, 2021 8:32 am Post subject: Re: 1972 Bus - Fuel in Oil |
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So I take it this is an electric pump. I would check pressure regulator with a gauge and then check and make sure the floats in the carbs aren’t stuck open and are adjusted properly as well as checking the flit needle valve and seat _________________ 1973 1.7L Bus |
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aeromech Samba Member
Joined: January 24, 2006 Posts: 16971 Location: San Diego, California
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Posted: Wed Jun 16, 2021 8:56 am Post subject: Re: 1972 Bus - Fuel in Oil |
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You must figure out the pump outlet pressure. It could be anywhere from 5 psi up to 40 psi. You are hoping for 5 and then regulate it down to about 2 1/2 _________________ Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
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Gregory1234 Samba Member
Joined: December 29, 2012 Posts: 9 Location: Southampton
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Posted: Wed Jun 16, 2021 9:30 am Post subject: Re: 1972 Bus - Fuel in Oil |
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Jrh5r wrote: |
So I take it this is an electric pump. I would check pressure regulator with a gauge and then check and make sure the floats in the carbs aren’t stuck open and are adjusted properly as well as checking the flit needle valve and seat |
It is an electric pump, though I'm not sure how much pressure is coming out of it.
I got a gauge with the regulator, but it doesn't seem to be registering anything which is why I think either the regulator is not working or the gauge is either set up right or not working
as for the carburetor, the needle and seat/float seemed to be working fine when it was apart and rebuilt
thank you very much for the reply! |
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Gregory1234 Samba Member
Joined: December 29, 2012 Posts: 9 Location: Southampton
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Posted: Wed Jun 16, 2021 9:32 am Post subject: Re: 1972 Bus - Fuel in Oil |
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aeromech wrote: |
You must figure out the pump outlet pressure. It could be anywhere from 5 psi up to 40 psi. You are hoping for 5 and then regulate it down to about 2 1/2 |
I wish I could figure out how much is coming out of the pump, the gauge I got with the regulator is not registering any pressure, I might have set it up wrong. Thanks for this, I didn't know what amount of psi the carburetor should be taking |
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busdaddy Samba Member
Joined: February 12, 2004 Posts: 51149 Location: Surrey B.C. Canada, but thinking of Ukraine
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Posted: Wed Jun 16, 2021 10:13 am Post subject: Re: 1972 Bus - Fuel in Oil |
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Gregory1234 wrote: |
as for the carburetor, the needle and seat/float seemed to be working fine when it was apart and rebuilt |
Did you weigh the float while it was out?, if it's partially sunk it doesn't matter if the needle and seat are OK. _________________ Rust NEVER sleeps and stock never goes out of style.
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sjbartnik Samba Member
Joined: September 01, 2011 Posts: 5998 Location: Brooklyn
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Posted: Wed Jun 16, 2021 12:51 pm Post subject: Re: 1972 Bus - Fuel in Oil |
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Gregory1234 wrote: |
I wish I could figure out how much is coming out of the pump, the gauge I got with the regulator is not registering any pressure, I might have set it up wrong. Thanks for this, I didn't know what amount of psi the carburetor should be taking |
You can (and must) figure it out by getting a working gauge. _________________ 1965 Volkswagen 1500 Variant S
2000 Kawasaki W650 |
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Gregory1234 Samba Member
Joined: December 29, 2012 Posts: 9 Location: Southampton
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Posted: Wed Jun 16, 2021 2:51 pm Post subject: Re: 1972 Bus - Fuel in Oil |
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busdaddy wrote: |
Gregory1234 wrote: |
as for the carburetor, the needle and seat/float seemed to be working fine when it was apart and rebuilt |
Did you weigh the float while it was out?, if it's partially sunk it doesn't matter if the needle and seat are OK. |
That never occurred to me, thank you! I'll take it apart and see what I can find |
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Wildthings Samba Member
Joined: March 13, 2005 Posts: 50351
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Posted: Wed Jun 16, 2021 9:16 pm Post subject: Re: 1972 Bus - Fuel in Oil |
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You want a gauge just for checking carburetor fuel pumps, or for checking carb fuel pumps and engine vacuum. A gauge that reads 0-40 or even 0-20 will typically be very inaccurate at the bottom end of their range.
Here is a cheapie Harbor Freight one: https://www.harborfreight.com/fuel-pump-and-vacuum-tester-62637.html |
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mikedjames Samba Member
Joined: July 02, 2012 Posts: 2743 Location: Hamble, Hampshire, UK
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Posted: Thu Jun 17, 2021 12:19 pm Post subject: Re: 1972 Bus - Fuel in Oil |
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The carburettor only needs a small amount of dirt in the needle valve and it will leak despite having the correct fuel pressure.
In the worst case, it will even leak with just the pressure of fuel from the tank, if the tank is full.
I protect my progressive from leaking by putting a solenoid cutoff valve between the fuel tank and the fuel pump, so when the ignition is off, there is no fuel pressure on the carburettor.
While I have owned my bus, driving it about 90000 miles, the needle valve has worn and leaked about four times, and on two occasions, the engine has flooded and stopped when driving gently because of fuel leaking past the metering valve.
But I do not get gas in the oil. _________________ Ancient vehicles and vessels
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Gregory1234 Samba Member
Joined: December 29, 2012 Posts: 9 Location: Southampton
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Posted: Fri Jun 18, 2021 6:15 am Post subject: Re: 1972 Bus - Fuel in Oil |
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Thanks! This is good info. |
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Gregory1234 Samba Member
Joined: December 29, 2012 Posts: 9 Location: Southampton
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Posted: Fri Jun 18, 2021 6:19 am Post subject: Re: 1972 Bus - Fuel in Oil |
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mikedjames wrote: |
The carburettor only needs a small amount of dirt in the needle valve and it will leak despite having the correct fuel pressure.
In the worst case, it will even leak with just the pressure of fuel from the tank, if the tank is full.
I protect my progressive from leaking by putting a solenoid cutoff valve between the fuel tank and the fuel pump, so when the ignition is off, there is no fuel pressure on the carburettor.
While I have owned my bus, driving it about 90000 miles, the needle valve has worn and leaked about four times, and on two occasions, the engine has flooded and stopped when driving gently because of fuel leaking past the metering valve.
But I do not get gas in the oil. |
This makes sense , I'm getting the opinion that whoever converted the fuel system in mine did a sort of quick-and-easy fix. Do you have any good recommendations for the solenoid? |
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Wildthings Samba Member
Joined: March 13, 2005 Posts: 50351
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Posted: Fri Jun 18, 2021 8:21 am Post subject: Re: 1972 Bus - Fuel in Oil |
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Unfortunately most all progressive installs are quick fixes. The throttle linkage and cables are most often a low grade jury rig and the crankcase ventilation is frequently not dealt with at all but to leave a hose dangling in the engine compartment spewing an oily mix.
Note that the VW Transporter fuel system is very similar to many marine setups where the fuel tank is above the level of the carburetor so adding elements of a marine fuel system can be a plus. A marine anti siphon valve to the system can keep the fuel system from leaking through when the engine is shut down. |
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Gregory1234 Samba Member
Joined: December 29, 2012 Posts: 9 Location: Southampton
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Posted: Fri Jun 18, 2021 9:04 am Post subject: Re: 1972 Bus - Fuel in Oil |
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Wildthings wrote: |
Unfortunately most all progressive installs are quick fixes. The throttle linkage and cables are most often a low grade jury rig and the crankcase ventilation is frequently not dealt with at all but to leave a hose dangling in the engine compartment spewing an oily mix.
Note that the VW Transporter fuel system is very similar to many marine setups where the fuel tank is above the level of the carburetor so adding elements of a marine fuel system can be a plus. A marine anti siphon valve to the system can keep the fuel system from leaking through when the engine is shut down. |
I was very confused when I found the crankcase breather tube just end in oblivion! That makes sense.
I like the concept of the siphon; when I took the carburetor out to rebuild it the whole bowl was incredibly full of gas, which I think contributed to the problem |
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