engine not getting ENOUGH gas
12-18-09, 03:26 PM
#27
A vacuum pump or bike pump on the FPR line would help to see if it's doing anything. Vacuum simulates idle (lower fuel pressure) and positive pressure simulates boost (higher fuel pressure).
You also can't check for vacuum leaks via the carb cleaner method unless the engine is running. Yours isn't running (right?), so no dice.
You also can't check for vacuum leaks via the carb cleaner method unless the engine is running. Yours isn't running (right?), so no dice.
12-18-09, 03:43 PM
#28
A vacuum pump or bike pump on the FPR line would help to see if it's doing anything. Vacuum simulates idle (lower fuel pressure) and positive pressure simulates boost (higher fuel pressure).
You also can't check for vacuum leaks via the carb cleaner method unless the engine is running. Yours isn't running (right?), so no dice.
You also can't check for vacuum leaks via the carb cleaner method unless the engine is running. Yours isn't running (right?), so no dice.
12-18-09, 03:52 PM
#29
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how about the water thermal sensor on the back of the waterpump housing? Is that connected? I know that on the FB's if that thermal sensor is bad or not connected then the 7 will not start........
12-26-09, 09:02 PM
#31
Okay guys, so I'm still having the same problem, but after messing with it and checking out different things, I now have a more specific idea of what's going on. Throw me your ideas.
I know that my fuel pump is hooked up, wired, and pumping correctly. I pull the fuel line off and it squirts fuel out. But when I hook up a gauge to the line, it reads zero pressure. I thought wtf, so i pulled the line off again, this time holding my finger over the line (blocking it). When i turned the pump on (ignition on with test connector jumped), i could feel the gas there, but it wasn't pushing very hard at all. Not enough especially to be around 35-38psi like it's supposed to (or somewhere around there) but when i take my finger off, it squirts out. So it's pumping enough to put gas in the lines, but not enough to give the engine the fuel pressure required to start/run.
Any ideas?
Also, i moved the gauge from between the fuel filter and engine to right out of the fuel tank, and same thing, so it's not the fuel filter or anything blocking somewhere on the fuel line.
So...bad fuel pump?
I just replaced it with one I bought on ebay, that didn't look used and the owner said they bought a long time ago as a backup but never used. This may be a problem. But it might be something else so I don't want to go buy a brand new fuel pump if I don't have to.
And a reminder, the car has been sitting for over a year before I bought it.
Which made me think, what if the fuel that was sitting in there rusted the inside of the metal fuel lines inside the tank? Is that a possibility? If someone thinks so, I'll pull it out tomorrow and look at it.
Ideas anyone???
I know that my fuel pump is hooked up, wired, and pumping correctly. I pull the fuel line off and it squirts fuel out. But when I hook up a gauge to the line, it reads zero pressure. I thought wtf, so i pulled the line off again, this time holding my finger over the line (blocking it). When i turned the pump on (ignition on with test connector jumped), i could feel the gas there, but it wasn't pushing very hard at all. Not enough especially to be around 35-38psi like it's supposed to (or somewhere around there) but when i take my finger off, it squirts out. So it's pumping enough to put gas in the lines, but not enough to give the engine the fuel pressure required to start/run.
Any ideas?
Also, i moved the gauge from between the fuel filter and engine to right out of the fuel tank, and same thing, so it's not the fuel filter or anything blocking somewhere on the fuel line.
So...bad fuel pump?
I just replaced it with one I bought on ebay, that didn't look used and the owner said they bought a long time ago as a backup but never used. This may be a problem. But it might be something else so I don't want to go buy a brand new fuel pump if I don't have to.
And a reminder, the car has been sitting for over a year before I bought it.
Which made me think, what if the fuel that was sitting in there rusted the inside of the metal fuel lines inside the tank? Is that a possibility? If someone thinks so, I'll pull it out tomorrow and look at it.
Ideas anyone???
12-26-09, 09:36 PM
#32
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Well, if you are pulling off the fuel line, and putting your finger over it, it should be squirting out all over the place. I think you are heading in the right direction, by pulling the fuel pump out, and checking it out. Also, you did say you put a new filter in it, right?
12-26-09, 09:45 PM
#33
Well, if you are pulling off the fuel line, and putting your finger over it, it should be squirting out all over the place. I think you are heading in the right direction, by pulling the fuel pump out, and checking it out. Also, you did say you put a new filter in it, right?
and yeah i put a new filter in.
12-27-09, 10:55 PM
#34
then the fuel pump is not generating enough pressure.think about it.
40 psi will get gasoline EVERYWHERE and all over the place. wear goggles.
check the fuel pressure directly at the output of the tank. if its still ****, then check that the connection to the pump is sound. was it the kind of fuel pump where you had to cut the hardline and attack it with a wormclamp and rubber hose? if yes, check the hose for leaks and that the wormclamp is tite. if it checks out, then get a new fuel pump.
40 psi will get gasoline EVERYWHERE and all over the place. wear goggles.
check the fuel pressure directly at the output of the tank. if its still ****, then check that the connection to the pump is sound. was it the kind of fuel pump where you had to cut the hardline and attack it with a wormclamp and rubber hose? if yes, check the hose for leaks and that the wormclamp is tite. if it checks out, then get a new fuel pump.
12-27-09, 11:06 PM
#35
then the fuel pump is not generating enough pressure.think about it.
40 psi will get gasoline EVERYWHERE and all over the place. wear goggles.
check the fuel pressure directly at the output of the tank. if its still ****, then check that the connection to the pump is sound. was it the kind of fuel pump where you had to cut the hardline and attack it with a wormclamp and rubber hose? if yes, check the hose for leaks and that the wormclamp is tite. if it checks out, then get a new fuel pump.
40 psi will get gasoline EVERYWHERE and all over the place. wear goggles.
check the fuel pressure directly at the output of the tank. if its still ****, then check that the connection to the pump is sound. was it the kind of fuel pump where you had to cut the hardline and attack it with a wormclamp and rubber hose? if yes, check the hose for leaks and that the wormclamp is tite. if it checks out, then get a new fuel pump.
12-31-09, 07:39 PM
#36
okay guys, so it just fired up for the first time on its own!
i pulled the pump out, and i realized the connection between the pump and the hard line wasn't sealed well ( i have no idea how it was supposed to be sealed like that because it wasn't working lol ) so i just cut off that weird thing and put on some fuel line and clamps, and that gave me pressure and it idled and reved up just fine. now i'm gonna replace all the fluids and see where to go from there.
i pulled the pump out, and i realized the connection between the pump and the hard line wasn't sealed well ( i have no idea how it was supposed to be sealed like that because it wasn't working lol ) so i just cut off that weird thing and put on some fuel line and clamps, and that gave me pressure and it idled and reved up just fine. now i'm gonna replace all the fluids and see where to go from there.
12-31-09, 09:07 PM
#38
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okay guys, so it just fired up for the first time on its own!
i pulled the pump out, and i realized the connection between the pump and the hard line wasn't sealed well ( i have no idea how it was supposed to be sealed like that because it wasn't working lol ) so i just cut off that weird thing and put on some fuel line and clamps, and that gave me pressure and it idled and reved up just fine. now i'm gonna replace all the fluids and see where to go from there.
i pulled the pump out, and i realized the connection between the pump and the hard line wasn't sealed well ( i have no idea how it was supposed to be sealed like that because it wasn't working lol ) so i just cut off that weird thing and put on some fuel line and clamps, and that gave me pressure and it idled and reved up just fine. now i'm gonna replace all the fluids and see where to go from there.
01-03-10, 01:14 AM
#41
okay so now it gets going well, but i'm having a couple other problems, during startup and idle. i'm going to post a video and a new thread soon maybe tomorrow but for now i'll try to explain and tell me what you guys think. when i start the car for the first time after a while, it starts, then goes really low on rpms and almost dies and it'll try to get up for a while and keep dipping down, and eventually it comes up to a steady idle. then, while idling, about every second or two (and it gets further apart the longer its idling until eventually it stops) it revs up a tiny bit. weird eh? i was thinking vacuum leak, or maybe i should just "unflood" the engine since it was sitting forever it might have weird crap in there. any thoughts?
01-03-10, 07:43 AM
#42
okay so now it gets going well, but i'm having a couple other problems, during startup and idle. i'm going to post a video and a new thread soon maybe tomorrow but for now i'll try to explain and tell me what you guys think. when i start the car for the first time after a while, it starts, then goes really low on rpms and almost dies and it'll try to get up for a while and keep dipping down, and eventually it comes up to a steady idle. then, while idling, about every second or two (and it gets further apart the longer its idling until eventually it stops) it revs up a tiny bit. weird eh? i was thinking vacuum leak, or maybe i should just "unflood" the engine since it was sitting forever it might have weird crap in there. any thoughts?
glad you fixed the problem man. i had an deep t\rooted feeling that this was EXACTLY the problem.
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