No power to fuel pump after new relay...

[lynden]

I've got no fuel pressure and I replaced the fuel pump relay today. I don't think (I've tested all wires into fuel pump) I'm getting power to the fuel pump. I figured it was a relay but unless I got a bad relay (it is used) there's something else going on. Any ideas?

Thanks in advance.

 

[mbrummal]

inertia switch?

 

[lynden]

I've pushed the hell outa the inertia switch. The relay seems to have power going to it, so I don't think it would be the inertia switch unless the inertia switch is between the relay and pump. Anyone know?

 

[riceybean]

Make a jumper and see if that get the pump running? good way to check if it is the relay

 

[lynden]

Will do...

Sooo... I'm an idiot. Apparently, if you install the relay in the dark, and don't ensure that you push both plugs ALL THE WAY IN, the relay doesn't make a proper connection :-/

Thanks for helping an idiot out

 

[p m]

Don't sweat it.
My most memorable fuel pump job (not on my truck) took about 8 hours, all at the restaurant parking lot in late July in Yuma, Arizona.
Given with the fact that fuel pump circuit is one of the simplest in the Classics and D1s, it is unbelievable. Every voltage reading fluctuated wildly measurement to measurement, under load/without load etc. In the end, we found that there wasn't a single problem - but several, and likely the pump was running underpowered for ages before it quit. The worst offender was likely the connector in the right rear wheelwell, but relay and the pump had to be replaced as well.