Fuel Pump Runs Intermittently

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Fuel Pump Runs Intermittently

September 08, 2021, 05:18:27 PM

'88 Thunderbird TC

About a month or so ago I thought my fuel pump went bad so I replaced it with a Walbro 255 lph that I had waiting to install. Ran fine for a few hundred miles until yesterday 1/2 mile from home.

Replaced the TFI cause it was erratic on running / not running yesterday. Thought I was gonna need a tow but it started and ran perfect to get it home.

I tried to warm the car up to set the timing after replacing the TFI (It's easier to remove the distributor to change TFI on the 2.3). Runs for a few minutes and dies. Timing light is flashing so I know I have spark. Fuel pump does prime when i turn the ignition on for starting. Doesn't prime every time I cycle the key back to back.

I get the car to run for a few moments to see the fuel pressure at 35 psi at idle then drop and the car dies.

I found the inertia switch and the white button is floppy. Doesn't seem to do anything either direction.

The intermittent thing has me thinking it isn't the inertia switch, but not sure. Should the button be floppy on the switch?
What next to check?

Thank you in advance.

Re: Fuel Pump Runs Intermittently

Reply #1 – September 08, 2021, 05:51:13 PM

Um.....inertia switch connector

Re: Fuel Pump Runs Intermittently

Reply #2 – September 09, 2021, 07:51:51 AM

At this point in time, I am thinking of removing that plug because it is garbage and jumping the wires together until I find a replacement plug and inertia switch.

I can see if the fuel pump continues to run while the car warms up and if it loses power then it is either the relay or pip?

Re: Fuel Pump Runs Intermittently

Reply #3 – September 10, 2021, 07:12:37 PM

Got it started and set the timing. Let it sit a few hours then took it on short trip around town. Hasn't died.......yet.

Realizing now I probably should have posted this in electrical.

Re: Fuel Pump Runs Intermittently

Reply #4 – September 11, 2021, 08:49:27 AM

Quote from: Mikey97D – on September 09, 2021, 07:51:51 AM

At this point in time, I am thinking of removing that plug because it is garbage and jumping the wires together until I find a replacement plug and inertia switch.

That should be OK in the short-term.