92' No Fuel Pressure
#1
Elite Member
Thread Starter
iTrader: (5)
Join Date: Jan 2007
Location: Freehold, NJ
Posts: 1,552
Total Cats: -2
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
So I was driving the other day and my whole car just powers down. let it sit for a while, while i tried to figure out what the hell was going on didn't have a fuel pressure gauge on me so I test some other stuff, after it sat for about 20min it started up again and drove for about 10 minutes; and then again it just died.
So I get the car towed home and try to start it with a fuel pressure gauge hooked up and its showing 0 fuel pressure. I replace the stock 20yr old pump with a new warlboro 190lph and still no fuel pressure.
I'm thinking its maybe the relay? It does prime occasionally but won't start. I do have a MS built by brain wired in parallel. And Where is the relay? lol not under the hood like it really should be.
So I get the car towed home and try to start it with a fuel pressure gauge hooked up and its showing 0 fuel pressure. I replace the stock 20yr old pump with a new warlboro 190lph and still no fuel pressure.
I'm thinking its maybe the relay? It does prime occasionally but won't start. I do have a MS built by brain wired in parallel. And Where is the relay? lol not under the hood like it really should be.
#6
Boost Pope
![](/mt2011/images_td/ranks/supporter1.gif)
![](/mt2011/images_td/ranks/smod.png)
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,339
Total Cats: 6,793
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Jumping the diagnostic connector is equivalent to the closure normally given by the AFM. It controls the "normal" coil of the fuel pump relay. In other words, there's no difference between jumping the diagnostic connector and driving normally, with the exception of the AFM itself.
Thus, if it does not work when trying to drive normally, but it does work when you jump the diagnostic box, then the AFM's switch contacts are bad (or the wiring to the AFM has a problem.)
Thus, if it does not work when trying to drive normally, but it does work when you jump the diagnostic box, then the AFM's switch contacts are bad (or the wiring to the AFM has a problem.)
#8
Boost Czar
![](/mt2011/images_td/ranks/supporter1.gif)
![](/mt2011/images_td/ranks/admin.png)
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,688
Total Cats: 4,113
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Well, if he deleted the AFM but was running a parallel...I'm going to assume he later added in the fuel pump control. As like joe said, the AFM took care of that.
If the fuel pump wasn't already just jumped in the box to begin with, I'm assuming a wire was ran from the MS to the fuel pump relay under the dash. I'd look into that connection.
If the fuel pump wasn't already just jumped in the box to begin with, I'm assuming a wire was ran from the MS to the fuel pump relay under the dash. I'd look into that connection.
Thread
Thread Starter
Forum
Replies
Last Post
stoves
Suspension, Brakes, Drivetrain
5
04-21-2016 03:00 PM
JesseTheNoob
DIY Turbo Discussion
15
09-30-2015 02:44 PM