![]() Now, in case you're in a hurry and need to know now what the solution was, Jim replaced the ‘Spider’ assembly (you can read his last post here: Repair Solution). I'm assuming the oil pressure switch is still good since the oil pressure gauge goes to normal pressures while turning the Jimmy over.Įverything seems to be pointing to the spider gummed up from sitting all summer? Is there anyway to check the spider or can it be rebuilt by me? I checked the fuel pressure at the valve and it shows 60 lbs. I checked the spider connector with a Noid light, which shows power going there: it flashes as the Jimmy is turning over. The meter shows 11.6 Volts for 2 seconds. I replaced the fuel pump, fuel regulator, fuel filter, fuel lines and checked for power at the relay, which it is getting. So I waited till October to replace them.Īfter replacing them the Jimmy wouldn't start. Last spring my fuel lines sprung a leak on a 1995 Jimmy. Jim initially used the following article: How To Test The ‘Spider’ Fuel Injector Assembly (4.3L, 5.0L, 5.7L) to test his ‘Spider’ fuel system.īut, that article only covers testing the ‘Spider’ assembly for fuel leaks and Jim's Jimmy didn't have any, so he emailed me: This ‘Spider’ assembly has either 6 or 8 individual fuel injectors which feed 6 or 8 nylon fuel lines.Īgain, even though this case study is about a 1997 4.3L GMC Jimmy with a CPI ‘Spider’ system, you can still apply the core test steps to the CSFI ‘Spider’ system.This system is used on all 4.3L, 5.0L, and 5.7L engines from 1996 to present.CSFI stands for: Central Sequential Fuel Injection.The ‘Spider’ assembly has only one fuel injector that feeds the 6 nylon fuel lines.This system was used on the 4.3L engines from 1992 to 1995 only.CPI stands for: Central Port Injection.What Vehicles Can I Apply This Info To?Īlthough this case study is about a 1995 4.3L GMC Jimmy, the info and tests in this article apply to all of the ‘Spider’ injector types on the road, whether it's a 6 or an 8 cylinder. In this article, we'll take a look at this phenomenon (no fuel being injected in one or several nylon fuel lines) and how to test it, via a real life case study of a reader of who was kind enough to share his diagnostic and repair experience with us (thanks Jim M.!). When this happens, the vehicle cranks but doesn't start. ![]()
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