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Fuel pumps... WTH??? |
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CamJam
Moderator Group Joined: Jan/04/2014 Location: Arizona Status: Offline Points: 6475 |
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Posted: Jun/15/2016 at 3:40pm |
I'm on my third fuel pump in 400 miles and it has just gone bad too! The first was bad right out of the box, the second lasted about a week, and the third one lasted about five months. The first two were U.S. made "Precision" brand from O'Reiily's, and the third was a Carter, though they all looked exactly the same and may have all come from the same factory for all I know.
They all do the same thing... leak oil out the vent holes. When they go bad, the car still runs, but will often stumble at or near full throttle. Is this a common problem, or should I be looking for some other cause? Crankcase or oil pressure perhaps? The car never leaks oil anywhere else. |
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'73 Javelin 360 (current project)
'72 Baja Bronze Javelin SST '69 Big Bad Orange AMX (2018 Teague Heritage Award) SOLD |
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THE MENACE
AMC Addicted Joined: Nov/04/2008 Location: So. California Status: Offline Points: 4428 |
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Cameron, have you checked the fuel pressure while cold? And then have you checked fuel pressure at different RPM's while the car is fully warmed up?
Excessive crankcase pressure can contribute to oil leaking, so you might try ruling that out first. Dennis |
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Former Owner of:
The Craig Breedlove "AERO AMX" Still Owner: SS/AMX #9 replica (THE BIG MENACE) 70 AMX 416, EFI, Nash 5 speed 70 Javelin 401, 727 (Wife's) 72 Gremlin Autocross Project. |
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401MATCOUPE
AMC Addicted Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5370 |
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Cameron....X2 with Dennis and he is expert on the Mechanical Fuel Pumps, it is what he does for a living!!!
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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
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CamJam
Moderator Group Joined: Jan/04/2014 Location: Arizona Status: Offline Points: 6475 |
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Could I just remove the oil breather cap hose temporarily to relieve the pressure and see if the leak stops? I've checked the PCV valve and it is not plugged. I know on my Opel the engine actually depends on a tiny vacuum line connected to the intake manifold to relieve pressure. If that line has a leak or gets plugged they will leak oil like crazy. |
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'73 Javelin 360 (current project)
'72 Baja Bronze Javelin SST '69 Big Bad Orange AMX (2018 Teague Heritage Award) SOLD |
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
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Just an odd thought... would an aftermarket cam gear gear allow too much oil flow and fling oil 360 degrees, and slowly build up oil in the fuel pump cavity, thus a leak later on than right away.
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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PlazinJavelin
Supporter of TheAMCForum Joined: Nov/02/2008 Location: Atlanta USA Status: Offline Points: 2703 |
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My local O'R was my go to place for years, but the quality has become so bad on some parts I buy nothing there anymore but hoses, oil and light bulbs. I get important parts online even if they cost more. Recent list of parts that died shortly after buying.... power steering pump, coil and 60 month battery that lasted about 34. I'm not surprised to hear about your fuel pump.
I can't pick on them exclusively. I've had parts from NAPA and AutoZone give up the ghost very early too. Often it seems they all carry the same stock just with a different brand name stamped on.
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19610 |
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The problem is that low volume parts get sent out to the lowest bidder. AMC specific parts are always low volume... The OEMs send those parts out to smaller suppliers, then those get pushed down to even smaller suppliers as demand dwindles, until all you can get are rebuilts, then parts get REALLY scarce... Try buying some Packard engine parts that are specific to Packard. It's not because Packard was an expensive car in its day, it's because there is little demand for replacements.
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Frank Swygert
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PlazinJavelin
Supporter of TheAMCForum Joined: Nov/02/2008 Location: Atlanta USA Status: Offline Points: 2703 |
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Seems the the problem is spreading beyond low volume. All my issues came with high count chrysler and toyota models.
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CamJam
Moderator Group Joined: Jan/04/2014 Location: Arizona Status: Offline Points: 6475 |
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A well-known AMC restorer tells me that he has the best luck with rebuilt original fuel pumps.
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'73 Javelin 360 (current project)
'72 Baja Bronze Javelin SST '69 Big Bad Orange AMX (2018 Teague Heritage Award) SOLD |
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CamJam
Moderator Group Joined: Jan/04/2014 Location: Arizona Status: Offline Points: 6475 |
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Problem doesn't seem to be crankcase pressure, as there is slight suction at oil breather even at higher rpms. Doesn't leak constantly though.
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'73 Javelin 360 (current project)
'72 Baja Bronze Javelin SST '69 Big Bad Orange AMX (2018 Teague Heritage Award) SOLD |
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