Hey guys, quick one. I have an 87 LG4 that had the in-tank pump. Where's the relay for this pump? I searched and everyones saying near the brake booster but im not seeing it. Can someone give me some better instructions or a picture? thanks!

 

Mine is near the brake booster, it has a rubber-like mount, that holds it to the relay bar.

 

mine on my 91 rs camaro is on the firewall there are three of them right next to brake booster it is the one farthest to the left if you are looking at the windshield there is a red wire with a black connector for manualy priming the pump that is coming from this relay

 

Did your car come with a carburetor from the factory?

 

yes, but it came with a pusher pump in the tank to eliminate vapor lock

 

yeah, I thought though that it only covered 82-84 models... was your car a 305? My car came with carb and is a 305, however I don't know if it has the intank fuel pump... I am going to do a TPI conversion and if I already have the baffle inside the tank then I don't need to purchase a new FI tank...

 

car was a 305 LG4, 1987 its now an LT1. All the tanks are the same if i recall. My car was suppose to have rubber lines, but it has metal lines all the way. Only mod i had to do to the fuel system was pull the pusher pump out, put in an FI one which is taller, cut the feed tube a little to fit the taller pump, and i was good to go. no need to buy a whole new sender unit.

 

As is oft discussed here, the '87 LG4's came with a pusher pump in the tank. late-'83-ish through '85 (reports vary) L69's also had the pusher pump. There was a dealer-installed vapor lock kit available to resolve vapor lock complaints that included a pusher pump, but they weren't very common. My '86 donor car had a thermostat-controlled blower that cooled down the carb when the engine was hot and not running, apparently part of the dealer vapor lock kit, but the donor car didn't have the pusher pump.

 

So then the only way to verify if my car has a pusher pump is to drop the tank or what? What would I be looking for, if it has the pusher pump, then I wouldn't need a new tank for my FI conversion, right? Just buy a Walbro and I'm set? I was going to ask if there was an RPO code as well, but from memory I was never able to find a label...

 

If you have an '87 it should also have the two-wire oil pressure switch in-line with the fuel pump relay, tee'd off the brass fitting that also holds the oil pressure sending unit. If it's got the switch it's got (or had) the pump. Reverse may not be the case.

 

So if this is the case, then a fuel injection pump will work in this tank, right? I won't have to keep the tank at least half full, so I don't run out of gas?


having the following, pretty much ensures that I have an intank fuel pump, right?



so the bottom one (big one on T) is the fuel pressure /oil pressure switch... I could run this off a toggle switch right?

The top one is the oil pressure switch connected to the gauge?

 

tic-toc

 

Nah, other way around. The small one should have a two-wire connector that controls the fuel pump relay-you'll have to pull out a wiring diagram to see how it controls it-I can't remember if it's part of the engine or ECM harness.

The larger unit is the OPSU with a single wire connector that controls the dash guage.

 

im converting my 87 LG4 to TPI and i wanna know where my relay is because i dont see it on the firewall, but i cut a trap door for the fuel pump and i do see a relay screwed in behind the rear seat... i was thinking it could be the fuel pump relay in the next few days ill come back with updates... i think i have to bypass VATS before my fuel pump can get power any ways. TO BE CONTINUED........

 

I'm pretty sure thats just the connector for the wires going to the sending unit and pump, not a relay