Xtremejr
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Hold my beer and watch this shit.
Posts: 493
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Post by Xtremejr on Jun 16, 2012 11:45:55 GMT -5
If my car sits for 6-8 hrs all the fuel seems to drain back into the gas tank. Just spent 500.00 on a new fuel pump and Holley carb hoping that would fix the problem but it hasn't any cheaper ideas? Fuel is in floats but none in fuel line just before fuel pump. Really starting to piss me off.
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Post by BR[] on Jun 16, 2012 18:20:55 GMT -5
they make an inline check valve or put an inline electric fuel pump with a push button to prime it while starting. This doesn't answer why, but it will get you going.
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Post by RAM Z on Jun 16, 2012 19:11:15 GMT -5
My coupe does that when it sits for a while. Check and see if its leaking down where the rubber hose clamps onto the steel line going into the pump. Might have a loose clamp.
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Post by rickman on Jun 16, 2012 21:16:53 GMT -5
There's also an inline fuel filter with a anti drainback valve built in - cheap! I'd get 2 - before and after the pump. Might blow-out the line to the tank, at the same time!
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Xtremejr
Member
Hold my beer and watch this shit.
Posts: 493
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Post by Xtremejr on Jun 16, 2012 21:37:44 GMT -5
ramz no leak or loose clamp. rickman I bypassed fuel filter and still nothing, however I didn't blow out the line to the tank. What do you guys think about a bad or weak sending unit? On a 65 is that a 3/8 line or a 5/16 line and is it single line or return line?
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Xtremejr
Member
Hold my beer and watch this shit.
Posts: 493
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Post by Xtremejr on Jun 17, 2012 8:44:40 GMT -5
maybe drain tank pull it out, change sending unit, and blow out fuel line. I just don't know why something so simple is causing me such a pain in the ass.
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Post by bubbasz1 on Jun 17, 2012 9:36:02 GMT -5
If your loosing your prime your have a leak somewhere. By the sound of it you have fuel between the pump and the carb, should be enough to refill the rest of the system on start up. But getting back to the problem and some answers to some of your question. No such thing as a weak sending unit for fuel delivery, either it's good or bad, usually only gets replaced if the sending unit fails not because of fuel pickup unless it gets plugged. The sending unit/ fuel pickup is 5/16 for non 442, 3/8 for 442. A/C cars get a return line. I might check the rubber line from the sending unit to the fuel line for cracks and if not that check for a fuel mark along the fuel line where rust or a rubbing condition might be causing the problem. I suppose the fuel pickup could be rusted between the rubber hose and where it enters the fuel tank also.
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Xtremejr
Member
Hold my beer and watch this shit.
Posts: 493
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Post by Xtremejr on Jun 17, 2012 10:13:46 GMT -5
I will drop the tank and check for leaks or cracks, however I don't see any fuel leaking onto the ground anywhere. As always Thanks for the Tips.
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Post by RAM Z on Jun 17, 2012 10:37:48 GMT -5
ramz no leak or loose clamp. rickman I bypassed fuel filter and still nothing, however I didn't blow out the line to the tank. What do you guys think about a bad or weak sending unit? On a 65 is that a 3/8 line or a 5/16 line and is it single line or return line? The sending unit name is a misnomer. It doesnt send fuel, it really just reads the level of fuel in the tank. Good or bad doesnt mean shit, its just a continuation of the fuel line into the gas tank. Fuel pump sucks the fuel.
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Xtremejr
Member
Hold my beer and watch this shit.
Posts: 493
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Post by Xtremejr on Jun 17, 2012 13:49:58 GMT -5
Ok so I pulled the tank and sending unit, tested sending unit and it works so I then blew out entire fuel line, then realized that I have one fuel filter about one foot from the fuel pump and its not a one way filter so if I install a one way filter near the tank itself I shouldn't run into any problems with fuel draining too far from filter... Duh I never even thought to check my filter. That has got to fix my problem since one way filter will act as a check valve also right.
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Post by shane on Jun 17, 2012 17:36:46 GMT -5
Is it possible you have a bad pump? I know you said its new I was wondering if the diaphragm could be bad. Just a thought.... I'm no expert at this.
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Xtremejr
Member
Hold my beer and watch this shit.
Posts: 493
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Post by Xtremejr on Jun 17, 2012 19:56:42 GMT -5
shane after the pump fuel exists in the line all the way to the carb and the bowls are full. I ordered a one way fuel filter with a check valve maybe it will do the trick. Any other advice keep it coming. Next I will have no choice but to re-run all the fuel line.
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Post by mongoose on Jun 18, 2012 5:49:04 GMT -5
Does anyone have a diagram of a mechanical fuel pump? Seems like there would need to be a chamber or section that draws fuel from the tank, and the other that pushes up to the carb. It could be the pressure side of the pump is fine, but the suction side has an air leak (i.e. bad new pump). Then perhaps if the car is parked on a slight incline, the fuel could siphon back into the tank... kind of like putting your finger over the tip of a straw in a soft drink cup, lifting the straw, then move your finger off of the straw.
Just another idea to consider. Maybe it'll spark more thoughts...
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Post by 65442 on Jun 18, 2012 7:30:49 GMT -5
"IF" you have fuel in the bowl and in the line from the pump to the carb it should start without hooking up additional fuel. It may only run for a couple of minutes but it should start. It sounds to me you have a problem with the choke on the carb. If its set up right you should push you foot to the floor ONCE and then keep your foot off the peddle and crank the engine. If its set up right the car will start. Try pouring a SMALL amount of gas directly into the carb and see if it starts and runs, if it does its your choke. Gary
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Deleted
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Post by Deleted on Jun 18, 2012 11:53:40 GMT -5
ramz no leak or loose clamp. rickman I bypassed fuel filter and still nothing, however I didn't blow out the line to the tank. What do you guys think about a bad or weak sending unit? On a 65 is that a 3/8 line or a 5/16 line and is it single line or return line? The sending unit name is a misnomer. It doesnt send fuel, it really just reads the level of fuel in the tank. Good or bad doesnt mean shit, its just a continuation of the fuel line into the gas tank. Fuel pump sucks the fuel. No misnomer here. The fuel/gas gauge sender unit does exactly what it`s name implies, it "sends" a value signal to the gas gauge. Without it, you would have a fuel/gas gauge mounted in your dash doing nothing. It`s called a fuel or gas gauge sending "unit" because it`s multifunctional, with the variable resistor/float being it`s main component. When the hall effect is perfected for automotive use then "fuel sender" can be dropped for "fuel level" that might put an end to any confusion as to what the sender unit does.
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Deleted
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Post by Deleted on Jun 18, 2012 12:00:39 GMT -5
If my car sits for 6-8 hrs all the fuel seems to drain back into the gas tank. Just spent 500.00 on a new fuel pump and Holley carb hoping that would fix the problem but it hasn't any cheaper ideas? Fuel is in floats but none in fuel line just before fuel pump. Really starting to piss me off. xtremejr, if you don`t get this figured out feel free to give me a call. I`d be typing my thoughts for god knows how long, and most members would be yawning.
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Post by RAM Z on Jun 18, 2012 12:27:57 GMT -5
The sending unit name is a misnomer. It doesnt send fuel, it really just reads the level of fuel in the tank. Good or bad doesnt mean shit, its just a continuation of the fuel line into the gas tank. Fuel pump sucks the fuel. No misnomer here. The fuel/gas gauge sender unit does exactly what it`s name implies, it "sends" a value signal to the gas gauge. Without it, you would have a fuel/gas gauge mounted in your dash doing nothing. It`s called a fuel or gas gauge sending "unit" because it`s multifunctional, with the variable resistor/float being it`s main component. When the hall effect is perfected for automotive use then "fuel sender" can be dropped for "fuel level" that might put an end to any confusion as to what the sender unit does. Fuel sending = something that sends fuel. I never said it wasnt important or needed. It just doesnt send fuel. Author of the thread, I think, thought the sending unit sent gas, and may be why his fuel is disappearing. What other things does it do besides send a signal to your gas gauge?
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Deleted
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Post by Deleted on Jun 18, 2012 14:42:48 GMT -5
No misnomer here. The fuel/gas gauge sender unit does exactly what it`s name implies, it "sends" a value signal to the gas gauge. Without it, you would have a fuel/gas gauge mounted in your dash doing nothing. It`s called a fuel or gas gauge sending "unit" because it`s multifunctional, with the variable resistor/float being it`s main component. When the hall effect is perfected for automotive use then "fuel sender" can be dropped for "fuel level" that might put an end to any confusion as to what the sender unit does. Fuel sending = something that sends fuel. I never said it wasnt important or needed. It just doesnt send fuel. Author of the thread, I think, thought the sending unit sent gas, and may be why his fuel is disappearing. What other things does it do besides send a signal to your gas gauge? To your question as to what else does "it" do, I will assume your referring to the sender itself. answer, nothing else. Just sends a signal. But the sender unit is comprised of parts and pieces, each of which have a separate function, non of which is to transfer fuel. Then there`s the pick up tube, as you referred to earlier as being nothing more than an extension of the external fuel line, true statement, but it too is part of the unit. then there`s the electrical connector, it too is part of the unit.. When you remove the sender from the tank you remove it as a unit, you can`t remove just the sender, or the float, or the float arm, or the filter sock, or the pick up tube. It`s a unit who`s main function is to send. "Author of the thread, I think, thought the sending unit sent gas, and may be why his fuel is disappearing." That quote is like saying my oil pressure is low, wonder if my oil sending unit isn`t "sending" enough oil. Everyone knows oil sending units don`t send oil, why should a fuel sending unit be any different? Is it because one is at the front of the car, and the other is at the rear? I know that`s a totally ridiculous question, that`s why I`ve always stressed terminology as being key in any discussion, and also why I don`t like getting in to many discussions. If everybody isn`t on the same page it gets frustrating and usually gets in to a pissin match. To solve a problem using a keyboard, with differing terminology is futile, and then throw in the fact that only bits and pieces of information and history are given makes it CRAZY !! None of this stuff is rocket science. It`s all pretty basic 101 technology. I`ll use the phone.
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Xtremejr
Member
Hold my beer and watch this shit.
Posts: 493
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Post by Xtremejr on Jun 18, 2012 15:11:25 GMT -5
I now know exactly what the sending unit does, after pulling it out of the tank i reconnected it and was messing around with it, never seen one before had no clue it just read fuel level. Any way my next thing is about the vent on the gas tank, people at my job said to plug the vent and replace the gas cap and I should be fine. Is their any truth to that? Cant really do anything till I get that check valve one way filter. Whats any ones thought on changing the line from the tank to the pump, could it be leaking even though I don't see any fuel on the ground from the tank to the pump? Lots of dumb questions however I have lots of ideas to try now.
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