fuel pump oil problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

speedracer · 01-03-2006, 07:58 PM

I keep blowing the oil pressure valve in my fuel pumps. I get about 1500miles out of a pump has anyone every had this trouble??

*Billla* · 01-03-2006, 08:03 PM

Oil pressure valve?

speedracer · 01-03-2006, 08:06 PM

Yeah mechanical fuel pump has a relief valve in it. With a small hole like a water pump. So if theres too much pressure it wont break the pump. I think

Longhorn Man · 01-03-2006, 10:13 PM

Can you explain / describe this in more detail?
What is the symptoms you are having?
Where is this part located?
What year/make/model of engine are you dealing with?
Stock original, stock replacement, or aftermarket parts?

Personally, I have never heard of this.

wibilly · 01-04-2006, 12:51 AM

sounds like you have a crankcase ventilation problem to me

*bskylerj* · 01-04-2006, 01:01 AM

I had this problem with the edelbrock fuel pumps. I now havean electric pump and no problems.

speedracer · 01-04-2006, 12:46 PM

had the problem with a stock pump first then edelbrock, then holley, mechanical fuel pump on my 327. I have 2 large breathers that I've checked every time this happens. I run around 85psi cold 55-60 warm never leaks anywhere else. I think I'm going to have to go electric but the more I look into it the more fuel cell guy and new lines and filters and the different pump with or without regulators all gets overwhelming.

jhow66 · 01-04-2006, 01:02 PM

Fuel pumps don't have oil pressure valves. Oiled by what comes by fuel pump rod and splash from return hole. What you see coming out vent hole is gas and oil. The pump diaphram is leaking on the up side. Have no idea why it keeps doing this other then maybe pulling a lot of junk out of tank.

speedracer · 01-04-2006, 01:11 PM

humm?? never leaks any gas no smell or rainbow no fuel pressure loss. and yes a better word would be pressure relief vent not valve.

jhow66 · 01-04-2006, 01:36 PM

Just what is your pumps doing?

speedracer · 01-04-2006, 02:02 PM

under load leaks oil out the vent hole

jhow66 · 01-04-2006, 02:13 PM

Sounds like your crankcase does not have enough vents. PCV working?

speedracer · 01-04-2006, 02:49 PM

yeah thats what I thought. I don't have a pcv I have 2 k&n breathers

Longhorn Man · 01-04-2006, 06:15 PM

Time to hook up a PCV. It is way better than breathers.

Sweet72 · 01-04-2006, 07:09 PM

I can see why a PCV would be better than breathers since it creates a slight negative pressure within the crankcase. You may have excessive ring blowby, causing higher than normal crankcase pressure. I just can't imagine oil venting at the fuel pump unless the breathers are clogged with oil and crud.

01-03-2006, 07:58 PM	#1
speedracer Blank Join Date: May 2005 Location: Southington, CT Posts: 221	fuel pump oil problem I keep blowing the oil pressure valve in my fuel pumps. I get about 1500miles out of a pump has anyone every had this trouble?? __________________ 1969 lwb 4/6 drop 17x8-18x10 torque thrust II's 327-420hp 2004R 3.73 posi. 1977 Corvette 350-375hp 4speed, silver show car. 2002 S10 xtreme, work truck 2004.5 VW jetta GLI 1.8T 6speed, weekend warrior. 2013 Audi A3 TDI, the wife's car

01-03-2006, 08:03 PM	#2
Billla Account Suspended Join Date: Sep 2005 Location: Monroe, WA Posts: 3,815	Re: fuel pump oil problem Oil pressure valve?

01-03-2006, 08:06 PM	#3
speedracer Blank Join Date: May 2005 Location: Southington, CT Posts: 221	Re: fuel pump oil problem Yeah mechanical fuel pump has a relief valve in it. With a small hole like a water pump. So if theres too much pressure it wont break the pump. I think __________________ 1969 lwb 4/6 drop 17x8-18x10 torque thrust II's 327-420hp 2004R 3.73 posi. 1977 Corvette 350-375hp 4speed, silver show car. 2002 S10 xtreme, work truck 2004.5 VW jetta GLI 1.8T 6speed, weekend warrior. 2013 Audi A3 TDI, the wife's car

01-03-2006, 10:13 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: fuel pump oil problem Can you explain / describe this in more detail? What is the symptoms you are having? Where is this part located? What year/make/model of engine are you dealing with? Stock original, stock replacement, or aftermarket parts? Personally, I have never heard of this.

01-04-2006, 12:51 AM	#5
wibilly Senior Member Join Date: Nov 2005 Location: northwestern wi Posts: 2,111	Re: fuel pump oil problem sounds like you have a crankcase ventilation problem to me __________________ common sense isn't so common anymore

01-04-2006, 01:01 AM	#6
bskylerj Account Suspended Join Date: Dec 2005 Location: SPOKANE, WASHINGTON Posts: 1,001	Re: fuel pump oil problem I had this problem with the edelbrock fuel pumps. I now havean electric pump and no problems.

01-04-2006, 12:46 PM	#7
speedracer Blank Join Date: May 2005 Location: Southington, CT Posts: 221	Re: fuel pump oil problem had the problem with a stock pump first then edelbrock, then holley, mechanical fuel pump on my 327. I have 2 large breathers that I've checked every time this happens. I run around 85psi cold 55-60 warm never leaks anywhere else. I think I'm going to have to go electric but the more I look into it the more fuel cell guy and new lines and filters and the different pump with or without regulators all gets overwhelming. __________________ 1969 lwb 4/6 drop 17x8-18x10 torque thrust II's 327-420hp 2004R 3.73 posi. 1977 Corvette 350-375hp 4speed, silver show car. 2002 S10 xtreme, work truck 2004.5 VW jetta GLI 1.8T 6speed, weekend warrior. 2013 Audi A3 TDI, the wife's car

01-04-2006, 01:02 PM	#8
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: fuel pump oil problem Fuel pumps don't have oil pressure valves. Oiled by what comes by fuel pump rod and splash from return hole. What you see coming out vent hole is gas and oil. The pump diaphram is leaking on the up side. Have no idea why it keeps doing this other then maybe pulling a lot of junk out of tank. __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

01-04-2006, 01:11 PM	#9
speedracer Blank Join Date: May 2005 Location: Southington, CT Posts: 221	Re: fuel pump oil problem humm?? never leaks any gas no smell or rainbow no fuel pressure loss. and yes a better word would be pressure relief vent not valve. __________________ 1969 lwb 4/6 drop 17x8-18x10 torque thrust II's 327-420hp 2004R 3.73 posi. 1977 Corvette 350-375hp 4speed, silver show car. 2002 S10 xtreme, work truck 2004.5 VW jetta GLI 1.8T 6speed, weekend warrior. 2013 Audi A3 TDI, the wife's car

01-04-2006, 01:36 PM	#10
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: fuel pump oil problem Just what is your pumps doing? __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

01-04-2006, 02:02 PM	#11
speedracer Blank Join Date: May 2005 Location: Southington, CT Posts: 221	Re: fuel pump oil problem under load leaks oil out the vent hole __________________ 1969 lwb 4/6 drop 17x8-18x10 torque thrust II's 327-420hp 2004R 3.73 posi. 1977 Corvette 350-375hp 4speed, silver show car. 2002 S10 xtreme, work truck 2004.5 VW jetta GLI 1.8T 6speed, weekend warrior. 2013 Audi A3 TDI, the wife's car

01-04-2006, 02:13 PM	#12
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: fuel pump oil problem Sounds like your crankcase does not have enough vents. PCV working? __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

01-04-2006, 02:49 PM	#13
speedracer Blank Join Date: May 2005 Location: Southington, CT Posts: 221	Re: fuel pump oil problem yeah thats what I thought. I don't have a pcv I have 2 k&n breathers __________________ 1969 lwb 4/6 drop 17x8-18x10 torque thrust II's 327-420hp 2004R 3.73 posi. 1977 Corvette 350-375hp 4speed, silver show car. 2002 S10 xtreme, work truck 2004.5 VW jetta GLI 1.8T 6speed, weekend warrior. 2013 Audi A3 TDI, the wife's car

01-04-2006, 06:15 PM	#14
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: fuel pump oil problem Time to hook up a PCV. It is way better than breathers.

01-04-2006, 07:09 PM	#15
Sweet72 Registered User Join Date: Nov 2003 Location: Alexandria, VA Posts: 1,534	Re: fuel pump oil problem I can see why a PCV would be better than breathers since it creates a slight negative pressure within the crankcase. You may have excessive ring blowby, causing higher than normal crankcase pressure. I just can't imagine oil venting at the fuel pump unless the breathers are clogged with oil and crud. __________________ '72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.



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