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Topic: No power - fuel pump (Read 1327 times) previous topic - next topic

No power - fuel pump

We popped the switch in the trunk to stop fuel when cranking the motor so we wouldn't have to deal with more flooding problems after a bad injector...pushing it back in, we aren't getting the pump to prime at all. Is the inertia switch bad? Is there a way to bypass it?

Code 67 wouldn't cause it, would it (we're jacking it up as I write this)? We get 67 and 87 and the fuel pump worked great prior to disabling it from the switch.

Help!
1988 Thunderbird Sport

No power - fuel pump

Reply #1 –
Whack it a couple times and reset it again...

Easy enough to to bypass just short the wires together...

My plug is connected by wire nuts, if the switch quits all I have to do is  connect the two wires and it's done...

No power - fuel pump

Reply #2 –
Yeah, we got it working.

Now we're trying to get to whether or not all the white smoke is stuff already in the exhaust or an engine problem. No fluid cross contamination and nothing ejecting out of the spark plug holes when we pulled the wires/spark plugs, disabled the fuel, and spun the starter so its looking like the catalytic converter flooded with coolant from an earlier blown head gasket from the stuck fuel injector. Pulling the exhaust to be sure since we can't run it again without pulling the driver side valve cover off to check the gasket as it began to sputter oil out onto the exhaust manifold after 5 minutes (I put on the passenger side so its not my fault!).

Edit:
Also apparently my coil is going out. 7.8k ohms.
1988 Thunderbird Sport

No power - fuel pump

Reply #3 –
From the 84 shop manual:
TFI IV ignition coil.
Primary resistance measured from + to - terminals: 0.3 to 1.0 ohm.
Secondary resistance measured from - to high voltage terminal: 8K to 11.5K ohms

No power - fuel pump

Reply #4 –
yeah, thats what my manual says. I wouldn't think 7800 ohms would prevent spark but it may be becoming inconsistent.
1988 Thunderbird Sport

No power - fuel pump

Reply #5 –
Gasket was pulled up at lower center valve cover bolt which is fixed. Exhaust is clean coming out the motor so all may be well. Motor keeps losing spark when it warms up though. Going to pick up a Motorcraft coil and put it in - should have the car on the road this weekend.

Why does everything in the entire car have to have issues when we put a new motor in?! It is getting to be spendy.
1988 Thunderbird Sport

No power - fuel pump

Reply #6 –
is the spark orangish?

if so,, likely your looking at a bad stator in the dizzy or the TFI.

weak spark when the car warms up is one symptom of the stator going out.  I recenly took one of those stators apart and was displeased with the solder joint the black wire has to the metal two hole bracket.

I had to use my pocket knife to whittle at it but,,,,, atleast i found the problem. 

If you remove the dizzy cap and rotor and,,,,,, the 8 blade thing a ma bob held on by two screws, you should be able to see where the blades pass thru the stator. 

There is a tiny magnet in there and if debis has collected on it, this will also cause spark issues.  I cleaned mine by reaching in there with a stronger magnet to collect debris.

On the wiring to the stator down deep in the dizzy, there are three.
red, green and black. 

That black wire that comes into the bottom of the rubber encased thing that is held by two screws needs to be ground.
You can reach down in there with a stick pin and prob the black wire.  Continuity check the black wire to the dizzy chassis and if you have anything greater than 1 ohm,, your solder joint is intermittant also.

the fix,,, get that black wire lugged to ground down in the dizzy or jumper it out side of the dizzy to your tfi connector.
 

No power - fuel pump

Reply #7 –
We had the distributor, TFI module, etc that came on my car and one that came with the engine we built up, both acted the same. I'm going to replace the coil to distributor wire when I find the extra one that was included when I bought the spark plugs (actually got 3, but one was short) but after replacing the coil, the car runs and drives great

Now, one (new) lifter that apparently is being noisier than the rest. Will have to see if it quiets down on its own or not. After going to 3 stores, we ended up with 8 lifters that that can be pressed in pretty far and 8 that were a little more firm so we split them intake and exhaust.
1988 Thunderbird Sport