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Re: 71 B Body shuts off after about 2 miles(fresh build)
[Re: Steve88]
#1619125
05/12/14 03:36 AM
05/12/14 03:36 AM
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Joined: Feb 2003
Posts: 4,809
Castlegar, BC, Canada
That AMC Guy
master
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master
Joined: Feb 2003
Posts: 4,809
Castlegar, BC, Canada
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I would suggest putting a fuel pressure gauge on it. That could tell a whole lot more about what's going on. Does the pump require a regulator or does it have a return system? Is it possibly sucking the sock shut inside the tank?
A pressure gauge might give some insight.
Bloody Mary, Full of Vodka, Blessed art thou among cocktails....
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Re: 71 B Body shuts off after about 2 miles(fresh build)
[Re: CokeBottleKid]
#1619128
05/12/14 06:48 AM
05/12/14 06:48 AM
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Joined: Jan 2003
Posts: 5,911
Athens, Greece
Pyper70
master
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master
Joined: Jan 2003
Posts: 5,911
Athens, Greece
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eliminate a variable....try driving it with your gas cap off...halfway through your OP I said "fuel tank is creating a vacuum"
Doesn't Spectre make aftermarket parts for the import crowd of low quality?? Those four nipples on the tank are route to each corner of the tank so as to remove air pocket, before you made the manifold, did you blow some compressed air through the nipples to make sure no packing peanuts or other debris were in there? Maybe the lines are of poor quality and they are collapsed...I am spitballing here
Family owned 1969 Charger R/T DualQuad 440/727/GVO/3.55s
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Re: 71 B Body shuts off after about 2 miles(fresh build)
[Re: Steve88]
#1619129
05/12/14 09:36 AM
05/12/14 09:36 AM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Likely culprit would be the pump but it is acting like it is cavitating from a line restriction. I vented the stock car fuel cell that way (added a parts house filter on the vent nipple) & worked fine. I would assume with a new tank/sender/sock that it ain't plugged up that quickly from junk from the gas pumps tho the symptoms sorta sound like that but with it happening that quick I'd think more likely the pump considering the noise. I'm assuming you've checked the AP at the time & the stream is weak/non existant. If I could borrow a cheap pump to sub in that'd be my choice. Holler how it goes
live every 24 hour block of time like it's your last day on earth
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Re: 71 B Body shuts off after about 2 miles(fresh build)
[Re: RapidRobert]
#1619130
05/12/14 10:09 AM
05/12/14 10:09 AM
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Joined: Aug 2007
Posts: 603
Mass
charge70
mopar
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mopar
Joined: Aug 2007
Posts: 603
Mass
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Any possibility that a rubber hose between the pump and the tank is collapsing.Just a thought. John.
1970 Dodge Charger R/T S.E.
1969 Dodge Dart GTS 440 M-Code
1970 Dodge Charger 500 383/4-speed w/A.C.
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Re: 71 B Body shuts off after about 2 miles(fresh build)
[Re: Steve88]
#1619131
05/12/14 01:00 PM
05/12/14 01:00 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
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Cincinnati, Ohio
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Quote:
I have a 71 383 Satellite that I just restored and it is having a problem after about 2 miles of drive time where the car shuts off and will not start until it sits for about 20 minutes. I am pretty sure its a fuel delivery problem but I am not sure why its happening. Everything is new so there should not be any problems with things being old, worn out or clogged. The car has a new Spectre stock replacement tank,new sending unit and a new electric fuel pump. The Pump is mounted on the frame rail and is below the bottom of the tank. I have 3/8" steel fuel line from the tank to the pump and then 3/8" steel fuel line to the carb and the line runs up the back of the motor pretty far away from any exhaust parts. After about 2 miles the car acts like it runs out of gas even though there is plenty in the tank. The pump becomes louder as if it has no fuel. After it sits for a while it will fire back up but not for long then does the same thing. The new tank has 4 vents on it and I made a manifold and connected all 4 vents to the manifold and then ran a line from the manifold up and vented it to atmosphere with a free flow filter to keep trash out of the tank. I thought maybe I do not have it vented correctly and maybe it is pulling a suction on the tank? Any advice is appreciated. Thanks
IMO
Typical problem, electric fuel pump cavatating from trying to suck up hill through a 3/8" pickup. It must be bigger(the inlet line) and gravity fed . I know hard to do with a stock tank.
And like what was said in the above post, no filters can be before the pump. Only the in tank strainer should be used before the pump.
And like said above, take your fuel cap off and drive it, but I doubt that is your problem because it sounds like you have the tank vented, although not the right way. It's going to smell like gas near your car with it vented like that.
It'll get worse when the weather get's hotter also. Wish I had better news for you. 
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Re: 71 B Body shuts off after about 2 miles(fresh build)
[Re: Steve88]
#1619133
05/12/14 03:24 PM
05/12/14 03:24 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
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Cincinnati, Ohio
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Quote:
I will try the things suggested but the part that stumps me is that I have a 57 Nomad I restored 6 years ago with an almost identical set up with no problems for for over 25k miles. The Nomad tank is similar to the Mopar tank and I mounted the pump below the level of the bottom of the tank so once it's primed it should be siphon from that point on and it's vented basically the same way except it just had one vent as opposed to four.
Can you swap the pump from the nomad for a test on your mopar and see if it's the pump?
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Re: 71 B Body shuts off after about 2 miles(fresh build)
[Re: Mr.Yuck]
#1619135
05/12/14 03:40 PM
05/12/14 03:40 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
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Cincinnati, Ohio
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Quote:
put a mech pump on it and see what ahppens. They are only like $20.
Well then I'm sure it would work. I run both my cars with mechanical pumps on 340 and 440 motors currently.
The 340 is going to be fuel injected(MSD Atomic) sometime this summer with the electric pump in the tank.
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Re: 71 B Body shuts off after about 2 miles(fresh build)
[Re: Steve88]
#1619137
05/12/14 08:47 PM
05/12/14 08:47 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Posts: 36,041
Lincoln Nebraska
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It sure sounds like the pump is bad or going bad or it is cavitating for whatever reason. Just thinking out loud but if cavitation can be caused by deadheading on the output side (I thought cav was in input side starvation problem) if so would a return line take care of it. Tho I believe there are alot of setups doing fine without a return line. k.i.s.s. I'm thinking bad pump especially since it haappens SO fast. Holler how it turns out
live every 24 hour block of time like it's your last day on earth
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Re: 71 B Body shuts off after about 2 miles(fresh build)
[Re: RapidRobert]
#1619140
05/14/14 12:52 PM
05/14/14 12:52 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
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Quote:
Quote:
Cavitation is not caused by anything on the outlet side, except maybe another pump attempting to get the fuel out of the first pump faster than it can pump.
Both the term "vapor lock" and the term "cavitation" mean that the fuel's vapor presure exceeds the pressure that the fuel sees at that particular point, causing the liquid to flash into vapor.
Ahhh now I understand it. Thanks Dog
Actually anytime gasoline is put under a vacuum it will turn to vapor very easy and electric fuel pumps can't suck or pump vapor. And the warmer it is the easier the fuel will turn to vapor. There for you don't want restrictions on the inlet side of a electric fuel pump.
A mechanical fuel pump with it's diaphragm does a much better job sucking fuel than a vane or gear electric pump.
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Re: 71 B Body shuts off after about 2 miles(fresh build)
[Re: Challenger 1]
#1619141
05/14/14 01:31 PM
05/14/14 01:31 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Yeah It's gonna be interesting when he posts what it ends up being. What jumps out at me is the fact that it is happening so fast.
live every 24 hour block of time like it's your last day on earth
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Re: 71 B Body shuts off after about 2 miles(fresh build)
[Re: RapidRobert]
#1619142
05/14/14 02:22 PM
05/14/14 02:22 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
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Cincinnati, Ohio
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Quote:
Yeah It's gonna be interesting when he posts what it ends up being. What jumps out at me is the fact that it is happening so fast.
That says to me that there is serious restriction somewhere.
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