![]() ![]() ![]() Injectors are probably fine too, the car runs. The FP relay is probably fine, if it weren't you wouldn't have fuel. when you are putting the engine under load that's when its noticeable that the pump is bad, the vehicle wont pull grades easily like it used to. Most efi pumps will fire a car if going bad for awhile. Check your fuel filters, check the sock on the pickup for the pump and also check the condition of the hose intank between the fuel pump and sending unit. What I'm saying is that old IROC unit is old. Now, turn the key, it primes and fires right away and has a better top end. The hose seemed a little old, so we replaced it,and put the tank back up (car fired right up.) The car used to take cycling the key to get it to prime enough to fire, and acted similar to yours. We could hear the pump priming.so pulled the tank back down, checked the clamps and they were tight. Put the tank back up and it wouldn't start (New pump was more efficient than old 140k pump). Fuel pressure was minimal when checked, but responded a little when vacuum was applied to the regulator, we replaced the pump with a 255 walbro. Secondly, the symptoms you're describing sound familiar to what my GF's car was doing. Thanks guys I really love this forum been soaking up a lot of info.Ĭheck/repair/replace fuel filters.I would be interested in what the pressure is, psi is important with efi. Where to start is the question? Do I begin with things like the fuel pump relay or is this just something a mechanic is better off problem solving for me. I am not sure exactly where to begin but I want to try and problem solve this on my own. Not sure if this is from sloshing in the fuel tank or some other reason. It seems to not be as bad when the tank is fuller but it still happens then once in a great while. When I am driving down the road sometimes when I come to a complete stop it will stall. It seems that it is a priming issue perhaps? It never seems to start for the first few times and everytime I must go back to off position, back to on,listen to pressure blah blah. When trying to start it I must put the key into the on position first,listen to the fuel pump pressurize then give it a try. The truck seems to be starving for fuel when I try to start it and also when I come to stops. As far as the installation goes the person told me that he put the tuned port injection fuel pump into the stock el camino tank. The el camino has no performance mods other than hedman full length headers and exhaust. It has a 1986 tuned port injected motor with the 90-92 speed density system. With that said the other day I picked up this el camino. So of course I jumped right in and got a couple vehicles that I really love and I am going to learn this stuff if it kills me. It beats having to drop the tank should I ever have to change the pump down the road.Hi everyone I am brand new to these forums and very wet behind the ears when it comes to working on cars. I am very pleased with the results of this installation. The only time I hear the pump is when I first turn the key before the engine starts. There is a center baffle in the stock tank which does help prevent sloshing to some degree. with good increased response at all RPM above idle. I checked the fuel pressure and at idle it puts out a sustained 40 psi. The pump I used is and airtex equal to an ac -185 it comes with a lifetime guaranty and was purchased form auto zone for $97.00. When I completed the installation the temperature in Texas was over 105 degrees and since then I've run it at below -5 with no fumes or any other problems. I try to keep the tank at least 1/4 full to prevent cavitations. The pump is mounted on top of the rear frame rail just at the rear of the tank, this provides some protection and also mounts the pump below the tank level. I added a 3/8 in return line to the stock sending unit and used the existing fuel pick up for the feed line I also retained the canister vent. I've been running my TPI converted 350 since June with an external fuel pump and have had no problems what so ever. ![]()
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