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Jeep Wrangler YJ
YJ General Discussion
Hard start problem when engine is cold
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<blockquote data-quote="c_anthony27" data-source="post: 428338" data-attributes="member: 19328"><p>Think I have it narrowed down to the check valve in the fuel pump</p><p>with it dead cold its 20 deg out also I put a clamp on the return fuel line turned the key the pump primed gauge went up to 30psi and held there didnt leak below 30psi tapped the key it fired right up on the first crank</p><p>gauge goes up to about 38lbs with it running (disconnected the clamp on the return line) let it warm up to 195 deg and it stays around 38lbs</p><p>disconnected the vacuum line on the fuel pressure regulator and the psi jumps up about 8lbs put the vacuum line back on and it returns to 38psi</p><p>so it looks to me that everything is in order except that check valve</p><p>i ordered an inline 5/16” fuel line check valve from amazon for )$10 ill install that next weekend and hopefully that cures the issue without having to drop the gas tank</p></blockquote><p></p>
[QUOTE="c_anthony27, post: 428338, member: 19328"] Think I have it narrowed down to the check valve in the fuel pump with it dead cold its 20 deg out also I put a clamp on the return fuel line turned the key the pump primed gauge went up to 30psi and held there didnt leak below 30psi tapped the key it fired right up on the first crank gauge goes up to about 38lbs with it running (disconnected the clamp on the return line) let it warm up to 195 deg and it stays around 38lbs disconnected the vacuum line on the fuel pressure regulator and the psi jumps up about 8lbs put the vacuum line back on and it returns to 38psi so it looks to me that everything is in order except that check valve i ordered an inline 5/16” fuel line check valve from amazon for )$10 ill install that next weekend and hopefully that cures the issue without having to drop the gas tank [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Hard start problem when engine is cold
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