mj_wils1970
mj_wils1970 New Reader
9/26/22 9:42 a.m.

Hi,

I'm looking for some opinions for why my Miata died.  

After four years of being off the road replacing rusty parts, I finally started my car the other day.  It started up and ran for about 30 minutes, idled and revved fine.  I moved the car out of the barn, drove it down the road and parked it with no issues.  A few days later I tried to start it and nothing.  Before I parked it in 2018 it never had an issue starting and ran great. 

While it was off the road, I had to replaced the rusty fuel tank and put in a new fuel pump.  The filter has about 6000 miles on it.  I removed the charcoal canister because it was in the way, I haven't put it back yet and was probably not going to if I'm honest.

So far I have:

 - Checked the plugs and have a strong spark.

 - Checked the fuel pump by jumping the f/p and grd in the diagnostic port and could hear it running with the gas cap removed.  

 - Put in a fuel pressure gauge inline with the feed line to the fuel rail, 0 pressure when cranking with the fuel pump jumper still in place.

Before I start tearing into things randomly, I'm thinking the feed line is plugged, was going to start by checking pressure at the fuel filter.

Am I going about figuring this out the right way?  Am I missing something?

I have mobility issues so I'm not looking forward to crawling under the car, so I'd like to minimize having to get under it.

Any tips would be appreciated.

 

Mike

 

 

 

 

 

Keith Tanner
Keith Tanner GRM+ Memberand MegaDork
9/26/22 10:30 a.m.

I think you're doing the right thing, you've identified that you definitely have a fuel pressure problem.

If you don't want to get underneath right away, you can check pressure at the pump - there's an access panel under the rear deck behind the driver's seat. Four bolts to remove the seat (if they're not rusty) and you'll have a much easier time mobility-wise. Pull off the feed line, get something in there to catch the fuel and give the pump a short burst. If you don't get fuel, pull the pump and check the pickup. If you do, it's time for that filter. It's not a bad idea to take a peek inside the tank anyhow to make sure you don't have debris in there.

mj_wils1970
mj_wils1970 New Reader
9/26/22 2:43 p.m.

In reply to Keith Tanner :

Hi,

That makes a lot of sense, thanks for the input.

Mike

TurnerX19
TurnerX19 UberDork
9/26/22 6:42 p.m.

Not a Miata, but I have personal experience with debris in a new tank, probably hiding behind a baffle during install-check.

mj_wils1970
mj_wils1970 New Reader
9/30/22 5:02 p.m.

Hi,

Just a quick update that it was a bad fuel pump.  Annoying thing is that it was a new pump but probably at least three years old.  

NAPA had one in stock so it only took me a few hours to swap in a new one.

It started up in seconds.  Lots of lifter tick but that's for another day lol

calteg
calteg SuperDork
9/30/22 6:23 p.m.

In reply to mj_wils1970 :

Sounds like it's time for an NB head swap...

mj_wils1970
mj_wils1970 New Reader
9/30/22 7:09 p.m.

In reply to calteg :

It's a 1.6, so I'd need to do an engine swap.  

One day 

Keith Tanner
Keith Tanner GRM+ Memberand MegaDork
10/1/22 12:13 a.m.

Tick will go away. Fresh oil and an Italian tune-up. 

Our Preferred Partners
aCq0TtS7TMNnXXh9fsTlTwGL4nCrVy4gshv0A5OfAlRdPvoNyJlWZlXVqR8RFnBb