Ok I've seen this thread a few times already but it seems the problem was never resolved. I'm having this problem now. My 91 civic takes a few min before the fuel pump will prime then I can start the car. I have 4 main relays which I switch back and forth to see if that's the cause but they all do the same thing. I got them from the junkyard by the way. Also the car will die randomly while I'm driving it but then I can start it right up. Sometimes even when it primes it won't start after that and i have to wait 25 min before i can drive it again. Fuel pump is new. Any ideas. It's not running any codes too. It did this once before but worked itself out.

 

have you checked that its getting power? did you replace the strainer?

if youhve power on key turn at the pump would seem the pump is the issue.. being new doesnt really mean much.

 

Sounds like a bad ECU.

 

Well is there an easier way to test if it's getting power other than dropping my gas tank again?

 

A few people told me that could be the problem

 

It's a common problem for aging ECUs. Swap in a known good ECU to see whether the problem is eliminated. Can you borrow an ECU from a friend?

 

Sounds like maybe an intermittent ground at the thermostat housing.

 

I thought that too. I've checked all of them and the wire harness is from swapshopracing so I hope it's not messed up but I doubt it

 

It's a p28 ECU. I don't know anyone with a manual p28. So the fuel pump taking a long time to prime is a common sign of the ecu going out? Also the car when warmed up idles crazy now. Up and down

 

What engine?

Any 92-95 Civic OBD1 ECU, either auto or manual, would be fine for testing purposes. You just need to verify that the fuel pump primes immediately and every time you turn the key to ON(II).

Yes, the symptoms are a perfect fit with a bad ECU.

Could be a related or separate issue.

 

Ya I figure tps... or now maybe the ecu lol

 

Ok cool thanks a lot I'll try a different ecu and see if that's the problem

 

...or dirty IACV, dirty FITV, air in cooling system, vacuum leak, air intake leak...

 

I can ship you my p28 ECU at a cost of 100 dollars a day not in my possession to make up my losses at work. For testing purposes you can use the ECU for 24 hours, then ship it back in a postage paid box (included in original shipment). There are a few guidelines:
1. You cannot open the ECU under any circumstances.
2. You cannot steal the ECU.
3. You cannot damage the ECU.
4. In the event of a damaged ECU, you will replace it at your expense.
5. Payments will be issued via paypal or cashier's check.

Let me know OP if you need my ECU.

 

crazy -- I assume you are not acquainted with the PM feature.

 

$100 a day.
How much do you charge to fly out, install, and tun the key?

 

crazy is a high end ECU prostitute.

 

Sorry, replied to the wrong poster lol