HELP! Fuel Problems!, Fuel problem Troubleshooting Options

[clay914]

Hello all, I'm Clay in Loveland, CO. I just bought my first 914 on the 5th (IMG:style_emoticons/default/biggrin.gif) . It's a 1972 1.7 FI with 91K on the odometer. The previous owner had bought it 2 years ago and had only put about 2 thousand miles on it. My Father and I are familiar with general mechanics having done quite a few restorations on other vehicles, plus my father owned a 914/6 before he had me...bummer I know. I digress....back to the car.

The body is straight, with very little rust (some in typical places but easily fixed), the motor seems to be a bit cold blooded and wants to surge a bit when it is cold but after about 5-10 mins it evens out and runs well. I have noticed that it seems a little weak in the 2000-3000 RPM range.

Now the problem......

After owning and enjoying my new car for 24 hours (no joke) my baby wouldn't start. (IMG:style_emoticons/default/sad.gif) Having removed the oil bath filter and using starter fluid proved that I didn't have an ignition problem but a fuel problem. I removed the plug in one of the fuel rails ,turned the key and no fuel and the same before and after the fuel filter in the engine bay. After thinking that over for 10 seconds I realized that when the pump was moved from the engine compartment to the front that whom ever made the adjustment didn't move the filter between the tank and the pump, I will fix this. Having done this troubleshooting I can only believe that the problem lies with the fuel pump located in the front. It hums for a second once the key is turned then nothing which tells me it is on but not pumping. Is there anything else that I can check? Is there a way to test the pump? Please help.

[swl]

So you are getting 'hum' for the one second but no fuel movement?

I'm wondering if the pump is 'stuck'. Kinda hard to explain sounds but does that 'hum' sound like the pump is turning or just labouring.

Is this a 3 port plug or 2 port?

I think I would do some really basic tests.
Lift the supply line - any gas there? (sediment in tank blocking the strainer)
If there is gas coming to the pump is anything coming out the delivery line? (Tap with hammer and try again)
If a three port is gas coming out the return line. (stuck bypass valve)

[clay914]

So you are getting 'hum' for the one second but no fuel movement?

I'm wondering if the pump is 'stuck'. Kinda hard to explain sounds but does that 'hum' sound like the pump is turning or just labouring.

Is this a 3 port plug or 2 port?

I think I would do some really basic tests.
Lift the supply line - any gas there? (sediment in tank blocking the strainer)
If there is gas coming to the pump is anything coming out the delivery line? (Tap with hammer and try again)
If a three port is gas coming out the return line. (stuck bypass valve)

Thanks,

Diagnosed bad pump since no fuel downstream. Plenty of fuel to pump. Pump is out of car but if it is just a stuck valve can it be corrected by me? somehow?

Don't really want to spend for a reman but probably should since I am this far.