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360 Mechanical Fuel Pump Replacement

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LakesideRamblin View Drop Down
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    Posted: May/17/2019 at 9:08pm
Started and pulled the Rambler out of the garage today.  Noticed fuel shooting out the fuel pump vent.  I assume a bad diaphragm.  It's a mechanical Carter M6505. Got a replacement.  I heard that I should pull oil dipstick and smell it to check for possible gas that may have entered the crankcase because of the diaphragm penetration/leak.  I think I do smell a faint whiff of gas so I will change the oil (darn, just changed about 200 miles ago).

My question is how do I know that the new fuel pump arm is seated properly against the rod (by feel)?

Thanks.

Matt
LakesideRamblin
69 Rambler 220 360
68 American 220 199
73 Javelin 360
"If you could kick the person in the pants responsible for most of your trouble, you wouldn't sit for a month." T. Roosevelt
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PHAT69AMX View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PHAT69AMX Quote  Post ReplyReply Direct Link To This Post Posted: May/17/2019 at 10:23pm
Fuel Pump Arm is Cam Snout Mounted Eccentric Actuated, not by a Rod afaik...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote billd Quote  Post ReplyReply Direct Link To This Post Posted: May/17/2019 at 10:36pm
Originally posted by PHAT69AMX PHAT69AMX wrote:

Fuel Pump Arm is Cam Snout Mounted Eccentric Actuated, not by a Rod afaik...


Yeah, isn't it SBC's that use the rod that slips down? AMC doesn't as the pump arm goes directly against an eccentric on the front end of the cam. No rod, nothing to hold up or get lost or drop down (other than fumble fingers dropping a bolt which by the laws of physics will always roll to the very center of the car on the floor.)
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LakesideRamblin View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote LakesideRamblin Quote  Post ReplyReply Direct Link To This Post Posted: May/18/2019 at 12:28am
Originally posted by billd billd wrote:

Originally posted by PHAT69AMX PHAT69AMX wrote:

Fuel Pump Arm is Cam Snout Mounted Eccentric Actuated, not by a Rod afaik...


Yeah, isn't it SBC's that use the rod that slips down? AMC doesn't as the pump arm goes directly against an eccentric on the front end of the cam. No rod, nothing to hold up or get lost or drop down (other than fumble fingers dropping a bolt which by the laws of physics will always roll to the very center of the car on the floor.)

LOL.  Thanks.  That solves my mystery.  Now just need to watch my butter fingers with the bolts. Smile
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69 Rambler 220 360
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"If you could kick the person in the pants responsible for most of your trouble, you wouldn't sit for a month." T. Roosevelt
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mopar_guy Quote  Post ReplyReply Direct Link To This Post Posted: May/18/2019 at 6:44am
Before you bolt that on, there was a thread about the new pumps not lasting long and that someone figured out why. Edit - I found the thread using Duckduckgo.


Edited by Mopar_guy - May/18/2019 at 6:50am

"Hemilina" My 1973, 5.7 Hemi powered Javelin
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LakesideRamblin View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote LakesideRamblin Quote  Post ReplyReply Direct Link To This Post Posted: May/18/2019 at 9:47am
Thanks MG. 

Very  interesting thread.  Although  CamJam's issue in the thread was oil leakage from the vent hole, it may have a defective design relationship to my problem, gas leakage from the vent hole.  It may simply boil down to two main factors, crappy current aftermarket mechanical fuel pump design and high alcohol content modern gas.

I will install a replacement fuel pump today that I bought from CarQuest (Carter M6505 crossover) and see what happens.  May take the old Carter (not original to the engine) apart and check it after removed.

I appreciate the input and link to the thread.


LakesideRamblin
69 Rambler 220 360
68 American 220 199
73 Javelin 360
"If you could kick the person in the pants responsible for most of your trouble, you wouldn't sit for a month." T. Roosevelt
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Post Options Post Options   Thanks (0) Thanks(0)   Quote LakesideRamblin Quote  Post ReplyReply Direct Link To This Post Posted: May/20/2019 at 7:02pm
Got it on.  No more spray out the vent hole.  But it leaked like a siv out the bottom outbound connection to the carb.  I think the flare was flattened pretty well on the old fuel pump.  Took off the metal line and re-flared it (double flare).  Helluva time lining up the threads at night (eyes not too good anymore).  Next morning bent the line slightly and got it threaded.  Carefully snugged it down, started the car, leaked, shut off the car, tightened slightly, started car, leaked slightly, shut off car, tightened slightly, started car, viola, no leaks.  I finally learned to take my time and not crank things like this down so tightly!

Bottom line as has been said in the above thread regarding CamJam's escapades, these replacement fuel pumps are not the best.  I will buy a good spare (check the arm for play) and keep it in the trunk for emergencies.  Good thing I was at home when the leak occurred.  

Learning lesson for me.  Thanks for the input.
LakesideRamblin
69 Rambler 220 360
68 American 220 199
73 Javelin 360
"If you could kick the person in the pants responsible for most of your trouble, you wouldn't sit for a month." T. Roosevelt
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