fuel pump surging, why?? |
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fuel pump surging, why?? |
Tab914 |
Aug 1 2005, 06:52 PM
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#1
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Member Group: Members Posts: 158 Joined: 25-April 04 From: Alexandria, Ontario, Canada Member No.: 1,978 Region Association: Canada |
Another one for you guys...........
Here is the problem I am trying to fix. Whenever the needle in the temp guage gets to about 1/4 the fuel pump starts surging. This causes the idle to start to go up and down in rythm with the fuel pump. Also when under load the car stutters and shudders and kinda wants to choke. Before the car gets up to that temp. it runs nice and smooth, strong on acceleration and no poping or backfiring on decel or anything. Just sounds great and runs fine. Idle is where it should be and fuel pump does not surge. Here is what has been done. -Valve adjustement -Dwell adjustement -Timing adjustement -Tested MPC as per proper ohms. Parts I have changed- coil, plugs, ignition points, trigger points, condenser, rotor, cap and wires. Questions:- what could make the pump surge like that? -does it make a difference how the MPC wire goes into it's conector? -How do I properly check the head temp sensor. -Could the intake temp. sensor be the cause. I am at a lost. Feel like I am going in circles. (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif) Has anyone had this kind of problem?? Desperate for advice. (IMG:http://www.914world.com/bbs2/html/emoticons/sad.gif) Thanks, Dominic. forgot to add. car is a 1974 2.0 with stock fuel injection. |
Tab914 |
Aug 4 2005, 08:22 PM
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#2
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Member Group: Members Posts: 158 Joined: 25-April 04 From: Alexandria, Ontario, Canada Member No.: 1,978 Region Association: Canada |
Ok. Well, as I am getting ready for what has now become my weekend project ( changing fuel hoses, fuel filter and checking fuel pressure to better inform you guys) I am going over fuel hose diagrams and notice that on all of them the fuel filter is in the front between the fuel tank and the fuel pump. It is set on the hose going into port "S' on the pump. On my car the fuel filter is in the back between the pump and the engine. It is set on the hose that is coming from port "D" on the pump. I am not sure how the return hose is set up i.e. the "Y" connector to split the fuel to the tank and to the pump. My question now is, can the fuel filter being where it is be problematic or is that a non issue? Also, on the diagrams, the fuel filter is shown having two different size ports. (7 & 9mm) I know that this is because of the different hose sizes but can you get away with a filter with say, two 8mm ports?
I would just like to clarify these issues before I start swaping hoses and finally checking the fuel pressure. Thanks guys. (IMG:http://www.914world.com/bbs2/html/emoticons/beerchug.gif) |
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