fuel pump relay bad?

[71Montego]

This happened twice so far. If it matters, I recently swaped in a BP to my auto festiva. I drive the car park it come out if a few minutes and I hear a click (possible under the dash) then she just cranks but will not start.
I did not think to check spark or fuel at the time and one time it was at night so I could not see. I come back 1 hour or so later and its fine. Has not happen consistantly. Car itself has 102K miles, engine 60K.
Any guess's?
thx

[georgeb]

Don't know if fuel pump jump plug still functional since swap but if so try it. (Recent thread). If still no pump noise, bang on tank with rubber mallet. Sometimes failing pump will start if jarred to next commutator segment.

[boydg1]

.... I am presently going through with a similar experience with about the same motor you have. Your problem almost sounds like fuel restriction or fuel filter, but I'm sure you have checked all of that. I DO LIKE what " georgeb" had to say:
"georgeb: Don't know if fuel pump jump plug still functional since swap but if so try it. (Recent thread). If still no pump noise, bang on tank with rubber mallet. Sometimes failing pump will start if jarred to next commutator segment."
.... Getting back to my situation. I presently have an original 4 BLADE fuel pump relay in the car and the manual says it should be a 5 Blade and has a resistance and voltage chart to boot, go figure-right. But in defense of the car manufacturer, and with lots of TIME going by, it now appears that the FIFTH Blade is non functional. Won't know until later today if this is finally the case, it's raining here. And, of course, there is still the possibility of the fuel pump.

This happened twice so far. If it matters, I recently swaped in a BP to my auto festiva. I drive the car park it come out if a few minutes and I hear a click (possible under the dash) then she just cranks but will not start.
I did not think to check spark or fuel at the time and one time it was at night so I could not see. I come back 1 hour or so later and its fine. Has not happen consistantly. Car itself has 102K miles, engine 60K.
Any guess's?
thx

[boydg1]

.... How about a (Recent thread) REFERENCE THREAD!!!

Thanks
.

Don't know if fuel pump jump plug still functional since swap but if so try it. (Recent thread). If still no pump noise, bang on tank with rubber mallet. Sometimes failing pump will start if jarred to next commutator segment.

[71Montego]

I understand the banging on the tank, but why would it rectify itself after a 1 or so?

[91_festy_Gl]

Just like having a B3, you should be able to turn the key on and push the flapper in the VAF. This should kick the fuel pump on if its good, or if the relay is good. I did this alot on my b3 build after cleaning the whole fuel system. I see no diffrence and this should work. the fuel pump is switched on by the flapper opening in the VAF.

[71Montego]

Ok, I want to make sure I understand. If it acts up again, I pull off the intake tube to the throttle body and open the valve and if I don't hear the Fuel pump go on, its a bad relay?

[boydg1]

.... You know, there is another possibility here with this engine. Have you checked your grounding wires (Poor Grounds, connections etc.). An incomplete or deficient signal can cause these very same issues, both Body, Frame and engine as well.:eeeeeek:
.

Ok, I want to make sure I understand. If it acts up again, I pull off the intake tube to the throttle body and open the valve and if I don't hear the Fuel pump go on, its a bad relay?

[71Montego]

I can and will check the grounds but would that cause an intermitant issue and still allowed it to crank over?

[georgeb]

Ok, I want to make sure I understand. If it acts up again, I pull off the intake tube to the throttle body and open the valve and if I don't hear the Fuel pump go on, its a bad relay?

You are bypassing the relay by doing the flap thing or the diagnostic plug jumper so if you still don't hear the pump run the pump is bad. If the pump runs after banging on the tank (jumper attached) is furthur proof the pump is bad. If the pump runs with the jumper or flap the relay or something else is the prob. Make sure key is on to jump.

[boydg1]

.... What camera are you using? Your shots are pretty good and the flash gives good coverage.:thumbright:
.

[71Montego]

nikon cool pics. 10 MP. it was like 89 bucks over a year ago

[IdealSociety]

jumper the fuel pump bypass when it happens next time, its the butterfly looking clip (just like the radiator fan connector) that is unused under the wiper motor. when you jumper the 2 connections there it will kick start the fuel pump, which with the car off you can usually hear or go back and put your hand on the tank and feel the vibration/whirr of the pump.

if you get nothing, either your wiring or pump is bad, usually the pump though. Thankfully if it is 255lph walbro's are cheap to be had and will allow for future upgrades to your BP

also for the sweet love of god, take that pic out of your signature. its freaking gigantic and it drives people nuts to have to scroll through pages of the same giant picture over and over taking up space. Downsize it to closer to what everyone else on the board's is please.

[71Montego]

great info thx
In ref to the pump and relay: Do I order an EGT pump to get 255 ? Are many relays interchangeable? I though I saw a cross ref once. I can get a miata one used for 8bucks as opposed to 70 for new. Pumps seem all over the place pricewise.
thanks

[IdealSociety]

the EGT pump is not a stock 255lph pump. if you look for one for an RX7 or miata thats made by walbro it should be a 255LPH unit.