The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 1973-1991 Dual fuel tank systems theory of operation

52napco · 07-03-2022, 06:47 PM

Good advice Hatzie...
I'm riding home a while ago from Lowe's racking my brain and it dawned on me I had put the hoses back like they were on the old switching valve I thought well you know maybe they're on the wrong port the left fuel pump might be running but it's Dead Heading against the right side port of that valve... worth a look makes sense as to why I'm not getting any fuel pressure... well low and behold I should have slowed down to speed up.....somebody I guess the previous owner, had the hoses switched from right to left so when the right fuel pump would switch on it was dead heading against the left port on the switching valve so I switched the hoses around and walla it runs like it's supposed to...

So at the end of the day the best advice I can give anybody is take about 30 minutes and really just look at everything to see what's been messed with over the years.. a lot of stuff happens on a 31-year-old truck over the years.

07-03-2022, 06:47 PM	#146
52napco Registered User Join Date: Jun 2014 Location: upstate sc Posts: 2,098	Re: 1973-1991 Dual fuel tank systems theory of operation Good advice Hatzie... I'm riding home a while ago from Lowe's racking my brain and it dawned on me I had put the hoses back like they were on the old switching valve I thought well you know maybe they're on the wrong port the left fuel pump might be running but it's Dead Heading against the right side port of that valve... worth a look makes sense as to why I'm not getting any fuel pressure... well low and behold I should have slowed down to speed up.....somebody I guess the previous owner, had the hoses switched from right to left so when the right fuel pump would switch on it was dead heading against the left port on the switching valve so I switched the hoses around and walla it runs like it's supposed to... So at the end of the day the best advice I can give anybody is take about 30 minutes and really just look at everything to see what's been messed with over the years.. a lot of stuff happens on a 31-year-old truck over the years.