Howell TBI conversion kit fuel pump won’t work

[Aml1990Jp]

Hello everyone I just installed a Howell TBI conversion kit on my 1990 YJ but fuel pump won’t work. Any ideas?

 

[Gilaguy23]

Verify you have power to the pump when the key is in run. It may be a dead pump, if it is call Howell.

 

[Flyer58]

What controls the pump with this conversion? The PCM or a new PCM? Newer injected YJ's have a safety feature that turns on the pump for 1 to 3 seconds to prime the injectors, then stops. Can you jump a fuel pump relay to get it to work?

 

[Gilaguy23]

I had a cj7 with the howell kit. for the most part it used chevy 4.3 parts with an inline electric fuel pump tapped into a hot when key on line. Im curious on a YJ how they do it but IIRC howell offers instructions on their website.

 

[Aml1990Jp]

Verify you have power to the pump when the key is in run. It may be a dead pump, if it is call Howell.

There’s no power to the pump but when I connected the pump directly to the battery it works.

 

[Aml1990Jp]

What controls the pump with this conversion? The PCM or a new PCM? Newer injected YJ's have a safety feature that turns on the pump for 1 to 3 seconds to prime the injectors, then stops. Can you jump a fuel pump relay to get it to work?

Yes the pump works when connected directly to the battery. It supposed get a signal from the Tach to the ECM (the main computer) so the to work but no signal.

 

[Gilaguy23]

Probably poking in the dark here but does or did the tach work? Jeeps can us a fuse to power something you'd never guess, so check every fuse, under the hood too. This might also be a perfect opportunity to hide a pump power supply switch hidden somewhere for anti theft purposes. If the engine is running, so is the pump.