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Oil from fuel pump
#1358144 Fri May 01 2020 08:06 PM
Joined: Oct 2012
Posts: 319
C
Chaz 58 Offline OP
Shop Shark
I was going to hook up the vacuum wipers to my double acting fuel pump and noticed a very slight oil drip starting to form from the Out side port. I hooked the vacuum line straight from the manifold and the wiper worked great. When I plumped the line to the manifold & fuel pump it had a harder time sweeping. The fuel pump isn't all that old, but seeing a bit of oil can't be great. Can anyone confirm my fear of a bad pump? Thanks


1958 Chevy Grumman Olson step van
Re: Oil from fuel pump
Chaz 58 #1358234 Sat May 02 2020 02:11 PM
Joined: Oct 2012
Posts: 319
C
Chaz 58 Offline OP
Shop Shark
I read that double action fuel pumps are prone to fail prematurely. Not sure about that, but I'm just going to get the regular type and run the wipers from the manifold only.


1958 Chevy Grumman Olson step van
Re: Oil from fuel pump
Chaz 58 #1358253 Sat May 02 2020 04:58 PM
Joined: Feb 2020
Posts: 16
B
Grease Junkie
I installed a double action pump in my 49 about seven years ago. It's still working fine and I'm transferring it to the 235 that's replacing the tired old 216. I'm installing a PCV system on the 235 so the vacuum boost will probably be helpful.

My truck had a 6 volt auxiliary vacuum pump on the firewall when I got it. It had been disconnected long ago and I didn't bother trying it out. Maybe there's a 12 volt version out there somewhere but switching to electric wipers would probably make more sense. That's my plan when the old vacuum wiper motor gives up the ghost.


1949 3600
Re: Oil from fuel pump
Chaz 58 #1361542 Fri May 22 2020 09:47 PM
Joined: Oct 2012
Posts: 319
C
Chaz 58 Offline OP
Shop Shark
I put in a NOS AC fuel pump and now the truck lacks power. Not sure if it's a coincidence or not. I'm going to replace fuel filter then check fuel flow from pump. I've checked timing but not valves yet. I wonder if being a NOS could have something to do with it. Can anything happen sitting on a shelf for 40 years??


1958 Chevy Grumman Olson step van
Re: Oil from fuel pump
Chaz 58 #1361543 Fri May 22 2020 09:48 PM
Joined: Oct 2012
Posts: 319
C
Chaz 58 Offline OP
Shop Shark
I put in a NOS AC fuel pump and now the truck lacks power. Not sure if it's a coincidence or not. I'm going to replace fuel filter then check fuel flow from pump. I've checked timing but not valves yet. I wonder if being a NOS could have something to do with it. Can anything happen sitting on a shelf for 40 years??


1958 Chevy Grumman Olson step van
Re: Oil from fuel pump
Chaz 58 #1361547 Fri May 22 2020 10:32 PM
Joined: Aug 2018
Posts: 219
D
Shop Shark
Rubber bits in NOS parts can be suspect, just from age. Check valves and diaphragm may be degraded. If it had been in service longer, then E10 might be a suspected culprit for damaging the diaphragm in NOS fuel pumps, as well, but unlikely on first few runs.

Re: Oil from fuel pump
Chaz 58 #1361556 Fri May 22 2020 11:36 PM
Joined: Dec 2017
Posts: 769
D
Shop Shark
Absolutely something can happen. The diaphragm can dry out and crack. When you exposed it to the ethanol laced junk that passes as gas these days could have easily degraded the diaphragm and/or the valves. Get a new pump. Don’t mess around. With a bad diaphragm, you could be pumping fuel into your crankcase. Not what you want. In fact, if the oil smells like gas, you should change the oil no matter how new it may be.

Last edited by Dragsix; Fri May 22 2020 11:41 PM.

Mike
Re: Oil from fuel pump
Chaz 58 #1361638 Sat May 23 2020 09:34 PM
Joined: Oct 2012
Posts: 319
C
Chaz 58 Offline OP
Shop Shark
Checked fuel delivery to carb and it filled a container very quickly. My next suspect is the accelerator pump. I noticed in the cutaway diagram of the Carter updraft diagram there is a spring in the pump. I feel no real resistance when I flip the pump down. Shouldn't I get a recoil from the spring? Thank you in advance for any knowledge and advice offered.


1958 Chevy Grumman Olson step van
Re: Oil from fuel pump
Chaz 58 #1361713 Sun May 24 2020 01:23 PM
Joined: Oct 2012
Posts: 319
C
Chaz 58 Offline OP
Shop Shark
The van idles very well, only when I need power for climbing hills or when I need speed the power just isn't there. I use Langdons HEI and wondering if the advance is not working.


1958 Chevy Grumman Olson step van
Re: Oil from fuel pump
Chaz 58 #1361795 Sun May 24 2020 09:25 PM
Joined: Oct 2012
Posts: 319
C
Chaz 58 Offline OP
Shop Shark
I cleaned out the carb with mineral spirits and advanced the timing a bit and seems to run better. I put on a different manifold earlier & thought I had a vacuum leak between the intake and exhaust but I tested with propane and smoke & I didn't hear/see anything. I think I hear a hissing noise on acceleration, but it could just be the engine. Hard to know if your doing it right sometimes.


1958 Chevy Grumman Olson step van
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