[mikesarge]

Here's a fun one:

TL DR: Is intermittent "no pump" at start up a symptom of a failing fuel pump?

Car is running EFI, so no CIS components present.

Every once in a while, usually once the car is warmed up, but occasionally on a random cold start, the fuel pump will not prime, and the car won't start. So far, after giving it a few minutes, it's started to work every time. It gives me pause about taking the car very far from home though.

I've removed the aftermarket alarm system, verified the wiring is good (continuity where it's supposed to be), and replaced the relay (and even bypassed it using a jumper in place of a relay), and the problems persist very intermittently.

Is this a dying fuel pump? unfortunately the fuel pump is a PITA to get to, so when it happens, the process of taking off my (bent) belly pan, and running 12v direct to the pump would likely be inconclusive at best.

The pump happily makes 40psi throughout the rev range for me as soon as it's running, as verified on the dyno.

Also, this happened before I ran the fuel pump relay reversal wiring to use my megasquirt signal to trigger the fuel pump, so i've isolated that as a factor, I think.

I gotta imagine the answer here is "check for voltage at the pump when it happens..." which basically means I gotta wait until it gets worse I guess.

I do feel like I've narrowed it down to the pump itself here given the relay jumper, but basically wanting confirmation that this is possible, before I start spending the time removing/replacing that stupid belly pan over and over again

Anyway, I welcome anyone's thoughts on this