Need help with oil leak - The 1947 - Present Chevrolet & GMC Truck Message Board Network

So.Cal.Super · 04-12-2007, 01:31 AM

I have an oil leak at the front passenger side of the engine. I degreased the area originally thinking it was coming from the gasket around the oil pump which now I can see looks dry. Even the bolts look dry. After some further reading on the boards I checked the bolt screwed in through the side of the block next to the oil pump and they are dry. The only thing I can see that maybe leaking is where the bowl of the fuel pump crimps to the pump. Never seen that before and wasn’t sure if it was possible. I have included pics and marked them to show where it is dry, (pic 2 and around the gasket in pic 3) what I see underneath and the crimp on the pump (pic 4, can it leak here??) that had some oil on it. Also, valve cover gaskets, head gaskets and timing chain are all dry.
Any info is appreciated.
Thanks.

dwaite72lnghrn · 04-12-2007, 06:01 AM

Are you sure it's not tranny fluid from a loose connection on the rad? It just looked a little red to me.

So.Cal.Super · 04-12-2007, 11:46 AM

nope its oil, it must just be the light I checked the cooler lines while under just to be safe and they are clean.

RACINJASON22 · 04-12-2007, 11:59 AM

They can leak from the crimp between the bowl and the pump body as you described. Not real common but it is possible. I have seen it when running a stock pump as this in high rpm circle track applications more than on street engines.

**Hart_Rod** · 04-12-2007, 12:39 PM

Isn't there supposed to be a bolt in these 2 holes?

RACINJASON22 · 04-12-2007, 12:46 PM

Kinda hasd my dioriented by looking at the camera angles. The lower hole is not important. No oil there but the upper hole should have a bolt in there for sure. Theis is the one that will hold up the pumpshaft when changing the pump. JUST REMEMBER short bolt not too long. If it is to long it will contact the pump shaft and you DO NOT want that. The shaft has a tight fit so not alot of oil will come out there but I will say there will be a leak.

So.Cal.Super · 04-12-2007, 01:00 PM

Ok guys I just went out with the mirror and flashlight and checked both holes. both are dry and clean. I know the motor was apart for a refresh a few years back, could someone have sealed something inside?(400BB if it matters) I will gladly put a bolt back in the top hole. anyone know where I can find what size and length I need? and If I replace the fuel pump should I just go to napa and order one or get a HP from summit?
Thanks for the help.

RACINJASON22 · 04-12-2007, 01:05 PM

Ahhh...I seee Ya know I was thinking small block. I even went out and checked to be 100% on a SBC that I had here because of the weird camera angle. I'm not real sure on the upper hole on the 402. I can check later if no one else chimes in.

RACINJASON22 · 04-12-2007, 01:08 PM

Oppps1 Forgot I dont really see a NEED to go high dollar on the pump. Your local parts store pump should be fine IMO. If you would want a better pump I have use the carter race pumps alot and I will use them again. They are rebuildable also. I am thinking the last one I bought was in the 50 to 60 dollar range. I will check.

killer71 · 04-12-2007, 01:10 PM

Look at the hoses in the very first picture; some kind of oil is draining down them. Could you trace that.

manimal · 04-12-2007, 01:13 PM

Just checked a 402 block, it does NOT require a bolt in either hole. Both are blind tapped. Check the pipe plug under the fuel pump. That is where the push rod goes through.
-Lance

RACINJASON22 · 04-12-2007, 01:15 PM

If you do find that it's the pump here's the pumps I was talking about SUMMIT CARTER FUEL PUMPS

So.Cal.Super · 04-12-2007, 01:24 PM

Thanks guys for the info, and I just double checked the pipe plug under the pump mount and its dry and clean. as far as the oil on the lines in the first pic, thats what had me tweaked in the first place being those are fuel and radiator hoses. I have a feeling its leaking from the crimp where the bowl mounts to the housing. I had never seen this before and as RACINJASON22 seems to confirm its rare. must be all that Racing I do in the big oval back and fourth to work.

I think I will go the new fuel pump route and while its apart degrease the whole area and double check. at least its not a bad leak and I check the oil daily to make sure. so I will get a new pump and get it on in the next week or so.

Thanks again for all the help.

04-12-2007, 01:31 AM	#1
So.Cal.Super It'll Buff Out! Join Date: Apr 2007 Location: San Diego Posts: 603	Need help with oil leak I have an oil leak at the front passenger side of the engine. I degreased the area originally thinking it was coming from the gasket around the oil pump which now I can see looks dry. Even the bolts look dry. After some further reading on the boards I checked the bolt screwed in through the side of the block next to the oil pump and they are dry. The only thing I can see that maybe leaking is where the bowl of the fuel pump crimps to the pump. Never seen that before and wasn’t sure if it was possible. I have included pics and marked them to show where it is dry, (pic 2 and around the gasket in pic 3) what I see underneath and the crimp on the pump (pic 4, can it leak here??) that had some oil on it. Also, valve cover gaskets, head gaskets and timing chain are all dry. Any info is appreciated. Thanks. Attached Images __________________ "Instructions are just another mans opinion" Become a Supporting Member http://67-72chevytrucks.com/vboard/payments.php Man Card Rules http://67-72chevytrucks.com/vboard/s...d.php?t=634550 72 Chevy Cheyenne Super 400 LWB Last edited by So.Cal.Super; 04-12-2007 at 01:34 AM.

04-12-2007, 06:01 AM	#2
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	Re: Need help with oil leak Are you sure it's not tranny fluid from a loose connection on the rad? It just looked a little red to me. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

04-12-2007, 11:46 AM	#3
So.Cal.Super It'll Buff Out! Join Date: Apr 2007 Location: San Diego Posts: 603	Re: Need help with oil leak nope its oil, it must just be the light I checked the cooler lines while under just to be safe and they are clean. __________________ "Instructions are just another mans opinion" Become a Supporting Member http://67-72chevytrucks.com/vboard/payments.php Man Card Rules http://67-72chevytrucks.com/vboard/s...d.php?t=634550 72 Chevy Cheyenne Super 400 LWB

04-12-2007, 11:59 AM	#4
RACINJASON22 GEARHEAD Join Date: Jan 2007 Location: CENTRAL,PA Posts: 2,284	Re: Need help with oil leak They can leak from the crimp between the bowl and the pump body as you described. Not real common but it is possible. I have seen it when running a stock pump as this in high rpm circle track applications more than on street engines. __________________ 72 SWB 2WD MY PROJECT 72 LWB 4X4 FUTURE PROJECT SUBSCRIBE HEREBOARD VENDORS HERE NORWOOD MEET SURVIVOR!

04-12-2007, 12:39 PM	#5
Hart_Rod ************* Join Date: Apr 2005 Location: Pensacola, FL Posts: 17,865	Re: Need help with oil leak Isn't there supposed to be a bolt in these 2 holes? Attached Images __________________ Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3

04-12-2007, 12:46 PM	#6
RACINJASON22 GEARHEAD Join Date: Jan 2007 Location: CENTRAL,PA Posts: 2,284	Re: Need help with oil leak Kinda hasd my dioriented by looking at the camera angles. The lower hole is not important. No oil there but the upper hole should have a bolt in there for sure. Theis is the one that will hold up the pumpshaft when changing the pump. JUST REMEMBER short bolt not too long. If it is to long it will contact the pump shaft and you DO NOT want that. The shaft has a tight fit so not alot of oil will come out there but I will say there will be a leak. __________________ 72 SWB 2WD MY PROJECT 72 LWB 4X4 FUTURE PROJECT SUBSCRIBE HEREBOARD VENDORS HERE NORWOOD MEET SURVIVOR! Last edited by RACINJASON22; 04-12-2007 at 12:47 PM.

04-12-2007, 01:00 PM	#7
So.Cal.Super It'll Buff Out! Join Date: Apr 2007 Location: San Diego Posts: 603	Re: Need help with oil leak Ok guys I just went out with the mirror and flashlight and checked both holes. both are dry and clean. I know the motor was apart for a refresh a few years back, could someone have sealed something inside?(400BB if it matters) I will gladly put a bolt back in the top hole. anyone know where I can find what size and length I need? and If I replace the fuel pump should I just go to napa and order one or get a HP from summit? Thanks for the help. __________________ "Instructions are just another mans opinion" Become a Supporting Member http://67-72chevytrucks.com/vboard/payments.php Man Card Rules http://67-72chevytrucks.com/vboard/s...d.php?t=634550 72 Chevy Cheyenne Super 400 LWB Last edited by So.Cal.Super; 04-12-2007 at 01:01 PM.

04-12-2007, 01:05 PM	#8
RACINJASON22 GEARHEAD Join Date: Jan 2007 Location: CENTRAL,PA Posts: 2,284	Re: Need help with oil leak Ahhh...I seee Ya know I was thinking small block. I even went out and checked to be 100% on a SBC that I had here because of the weird camera angle. I'm not real sure on the upper hole on the 402. I can check later if no one else chimes in. __________________ 72 SWB 2WD MY PROJECT 72 LWB 4X4 FUTURE PROJECT SUBSCRIBE HEREBOARD VENDORS HERE NORWOOD MEET SURVIVOR! Last edited by RACINJASON22; 04-12-2007 at 01:05 PM.

04-12-2007, 01:08 PM	#9
RACINJASON22 GEARHEAD Join Date: Jan 2007 Location: CENTRAL,PA Posts: 2,284	Re: Need help with oil leak Oppps1 Forgot I dont really see a NEED to go high dollar on the pump. Your local parts store pump should be fine IMO. If you would want a better pump I have use the carter race pumps alot and I will use them again. They are rebuildable also. I am thinking the last one I bought was in the 50 to 60 dollar range. I will check. __________________ 72 SWB 2WD MY PROJECT 72 LWB 4X4 FUTURE PROJECT SUBSCRIBE HEREBOARD VENDORS HERE NORWOOD MEET SURVIVOR!

04-12-2007, 01:10 PM	#10
killer71 Registered User Join Date: May 2006 Location: at work Posts: 2,552	Re: Need help with oil leak Look at the hoses in the very first picture; some kind of oil is draining down them. Could you trace that. __________________ R.I.P. Killer 71 10/26/07

04-12-2007, 01:13 PM	#11
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: Need help with oil leak Just checked a 402 block, it does NOT require a bolt in either hole. Both are blind tapped. Check the pipe plug under the fuel pump. That is where the push rod goes through. -Lance __________________ ------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT

04-12-2007, 01:15 PM	#12
RACINJASON22 GEARHEAD Join Date: Jan 2007 Location: CENTRAL,PA Posts: 2,284	Re: Need help with oil leak If you do find that it's the pump here's the pumps I was talking about SUMMIT CARTER FUEL PUMPS __________________ 72 SWB 2WD MY PROJECT 72 LWB 4X4 FUTURE PROJECT SUBSCRIBE HEREBOARD VENDORS HERE NORWOOD MEET SURVIVOR! Last edited by RACINJASON22; 04-12-2007 at 01:16 PM.

04-12-2007, 01:24 PM	#13
So.Cal.Super It'll Buff Out! Join Date: Apr 2007 Location: San Diego Posts: 603	Re: Need help with oil leak Thanks guys for the info, and I just double checked the pipe plug under the pump mount and its dry and clean. as far as the oil on the lines in the first pic, thats what had me tweaked in the first place being those are fuel and radiator hoses. I have a feeling its leaking from the crimp where the bowl mounts to the housing. I had never seen this before and as RACINJASON22 seems to confirm its rare. must be all that Racing I do in the big oval back and fourth to work. I think I will go the new fuel pump route and while its apart degrease the whole area and double check. at least its not a bad leak and I check the oil daily to make sure. so I will get a new pump and get it on in the next week or so. Thanks again for all the help. __________________ "Instructions are just another mans opinion" Become a Supporting Member http://67-72chevytrucks.com/vboard/payments.php Man Card Rules http://67-72chevytrucks.com/vboard/s...d.php?t=634550 72 Chevy Cheyenne Super 400 LWB



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